1) 12x = 60
x = 60/12
x = 5
2) 33y = 132
y = 132/33
y = 4
3)51z = 357
z = 7
4) 2x-15 = 13
2x = 13+15
2x = 28
x = 28/2
x = 14
5) 7y-25 = 45
7y = 45+25
7y = 70
y = 70/7
y = 10
6) 130-4x = 70
4x = 130 - 70
4x = 60
x = 60/4
x = 15
7) 49-3x = 34
3x = 49-34
3x = 15
x = 15/3
x = 5
8) 9y-89=55
9y = 55+89
9y = 144
y = 144/9
y = 16
9) 74-8z = 2
8z = 74-2
8z = 72
z = 72/8
z = 9
Всё) Не забудь сказать спасибо)