1 card
Х + 65 = 165 + 2
43 + Х = 500 : 10
X – 25 = 100 x 2
320 – X = 45 x 2
X x 5 = 280 – 250
35 : Х = 78 – 73
60 x X = 36 + 84
X : 4 = 20 x 2
2 cards
42 + Х = 749 – 26
X + 100 = 500 x 2
Х – 2 = 4050 – 43
624 – Х = 238 + 300
X x 2 = 430 + 30
25 : Х = 15 : 3
Х : 10 = ( 42 + 48 ) – 83
42 x x = 36 + 48
3 cards
X + 20000 = 500 x 8
65 + Х = 140 : 2
48 – Х = 140 : 2 – 65
Х – 30 = 650 + 10
Х : 5 = 36 + 14
X x 30 = 280 + 320
400 : X = 4 x 2
32 x X = 25 + 7
4 cards
X + 43 = 4 x 2 + 50
86 + X = 40 x 2 + 50
X – 25 = 40 + 3 x 20
100 – X = 42 : 7 x 5
X x 5 = 20 : 4 + 10
600 : X = 4 – 1 x 2
40 x X = 50 x 2 + 20
X : 4 = 700 – 65 x 10
5 card
X + 150 = 40 x 2 + 36 x 2
41 + X = 35 x 2 x 2
X – 25 = 500 – 40 x 10
920 – X = 801 – 1 x 1
X x 7 = 5 + 150 : 5
30 x X = 200 + 2 x 5
X : 3 = 27 : 9 x 5
42 : Х = 90 – ( 50 + 34 )
6 card
39 + X = 42 x 2 + 5
X + 32 = ( 25 + 65 ) x 2
Х – 95 = 66 + 21 + 13
79 – X = 33 x 2 + 4 x 1
Х : 5 = ( 62 – 22) : 5
33 x X = ( 23 – 3 ) x 5 – 1
84 : Х = (65 – 60 ) + 37
X : 100 = ( 45 + 5 ) x 4
7 card
X + 4 = 60 x 2 : 4
92 + X = ( 400 + 2 ) x 2
X – 35 = ( 765 – 65 ) x 2
98 – X = 44 x 2 + 2
X x 3 = 43 + 8 x 4
36 x X = 64 : 8 x 9
X : 50 = ( 35 + 15 ) x 4
1800 : X = 36 : 4 x 60 + 60
8 card
15 + X = 7256 + 2 x 4
X + 49 = 25 x 4 x 2 + 50
X – 720 = 49 : 7 x 9
657 – X = 250 : 5 x 4
X x 23 = 150 : 3 + 19
75 x X = 30 x 6 – 30
X : 50 = 2 x 9 + 2
630 : X = 36 x 2 – 2
9 card
Х + 64 = 36 : 9 + 21
136 + X = 50 x 2 x 3
Х – 925 = 600 : 2 + 700
2000 – X = ( 1000 – 2 ) x 2
X x 8 = 820 – 45 x 4
70 x X = 131 + 36 : 4
500 : X = 25 : 5 x 10
X : 25 = 42 x 2 – 68
10 card
X + 29 = 990 + 60 x 2
35 + X = ( 2 + 5 ) x 52
X – 728 = 2 x 24 x 10
523 – X = 21 : 3 x 10
X x 90 = 75 x 2 + 30
60 x X = 3 x 6 x 10
Х : 5 = 400 : 8 + 5
360 : X = 85 x 2 + 10
11 card
X + 409 = 65 x 3 + 700
260 + X = 700 + 6 x 5
X – 612 = 420 : 6 x 9
2694 – X = 40 x 4 + 2
X x 30 = ( 502 + 28 ) x 3
45 x X = 20 x 5 – 10
X : 200 = 680 – 40 x 2
560 : Х = ( 40 + 30 ) : 10
12 card
X + 500 = 600 x 2 + 300
406 + X = 925 – 5 x 5
Х – 39 = 1800 : 2 + 33
786 – X = 32 x 5 : 2
X x 100 = 59 x 3 x 1000
810 : X = 1000- ( 60 x 3 + 10 )
60 x X = ( 30 x 2 ) x 10
X : 3 = 59 x 4 : 2
13 card
X + 429 = 65 x 2 x 5
728 + X = 500 x 2 + 15
Х – 39 = 360 : 4 + 1
450 – Х = 720 : 8 + 60
X x 7 = ( 618 + 2 ) + 10
3 x X = 42 x 3 x 5
X : 7 = 58 x 9 + 28
650 : Х = 81 : 9 + 1
14 card
62 : Х + 38 = 40
73 + (50 : Х + 2) = 100
(100 – Х : 4 ) – 30 = 54
400 – (5 x x + 125) = 205
( 40 x X + 140 ) x 5 = 2500
5 x ( 69 – 120 : X ) = 45
(150 : Х + 50) : 5 = 73 – 53
150 : (45 : Х + 35) = 27 : 9
15 cards
(720 : Х – 2) + 40 = 128
(4 x x x + 20) + 720 = 900
(X x 5 + 25 ) – 415 = 60
900 – (4 x X – 60) = 360
( 42 – X – 7 ) x 30 = 420
2 x ( 36 – 52 : X ) = 20
( 40 x X – 40 ) : 4 = 30
480 : (Х : 4 + 1) = 64 : 8
16 card
( 60 : Х + 5 ) + 25 = 50
800 + ( 420 : Х – 10 ) = 1000
( 400 : Х + 5 ) – 5 = 200
1000 – ( 4500 : Х + 80 ) = 420
(54 : x + 30 ) x 2 = 72
8 x ( 36 + 4 x X ) = 480
(6 x X + 12 ) : 6 = 50
350 : (20 x X – 15) = 70
17 card
420 + (4 x X + 360) = 940
350 + (600 – 5 x X) = 450
(4 + x x 9) – 36 = 40
660 – (8 x X + 20) = 480
(4 x X + 2) x 6 = 180
9 x (4 x X + 10) = 810
(150:Х-50):5=73-53 81:(42-3хХ)=66-7х9
18 card
(Х : 20 + 40) – 70 = 30
64 + ( Х : 4 + 6) = 100
(64 : Х + 138) – 50 = 90
925 – (80 : Х – 15) = 900
(95 – 45 : X) x 9 = 810
6 x (20 : x – 15) = 30
(3 x X – 30) : 2 = 68 – 8
720:(Хх4-46)=150х3-90
Answers:
1. 102; 7; 225; 230; 6; 7; 2; 160.
2. 681; 900; 4009; 86; 230; 5; 700; 2.
3. 2000; 5; 43; 690; 250; 20; 50; 1.
4. 15; 44; 125; 70; 3; 300; 3; 200.
5. 2; 99; 125; 120; 5; 7; 45; 7.
6. 50; 148; 195; 9; 40; 3; 2; 20000.
7. 26; 712; 1435; 8; 25; 2; 10000; 6.
8. 7249; 201; 782; 457; 3; 2; 1000; 9.
9. 89; 164; 1925; 4; 80; 2; 10; 400.
10. 1081; 329; 1208; 453; 2; 3; 275; 2.
11. 486; 470; 1242; 2532; 53; 2; 120000; 80.
12. 1000; 494; 972; 706; 1770; 1; 10; 354.
13. 221; 287; 130; 300; 90; 210; 3850; 65.
14. 31; 2; 64; 14; 9; 2; 3; 3.
15. 8; 40; 90; 150; 2; 2; 4; 236.
16. 3; 2; 2; 9; 9; 6; 48; 1.
17. 40; 100; 8; 20; 7; 20; 1; 5.
18. 1200; 120; 32; 2; 9; 1; 50; 12.
