1) 12 + x = 25x = 25 - 12x = 13
2) 37 - y = 30y = 37 - 30y = 7
3) a - 15 = 8a = 8 + 15a = 23
Ответ: x = 13, y = 7, a = 23.
1) 12 + x = 25
x = 25 - 12
x = 13
2) 37 - y = 30
y = 37 - 30
y = 7
3) a - 15 = 8
a = 8 + 15
a = 23
Ответ: x = 13, y = 7, a = 23.