1. 8х – 7х + 10 = 12
х = 12 – 10
х = 2
2. 13у + 15у – 24 = 60
25у = 60 + 24
25у = 84
у = 3,36
3. 3z – 2z + 15 = 32
z = 32 – 15
z = 17
4. 6t + 5t – 33 = 0
11t = 33
t = 3
5. (x + 59) : 42 = 86
x + 59 = 86 * 42
x + 59 = 3612
x = 3612 – 59
x = 3553
6. 528 : k – 24 = 64
528 : k = 64 + 24
528 : k = 88
k = 528 : 88
k = 6
7. p : 38 – 76 = 38 4332
p : 38 = 38 + 76
p : 38 = 114
p = 114 * 38
p = 4332
8. 43m – 215 = 473
43m = 473 + 215
43m = 688
m = 16
9. 89n + 68 = 9057
89n = 9057 – 68
89n = 8989
n = 101
10. 5905 – 27v = 316
5905 – 316 = 27v
5589 = 27v
207 = v
11. 34s – 68 = 68
34s = 68 + 68
34s = 136
s = 4
12. 54l – 28 = 26
54l = 26 + 28
54l = 54
l = 1