1) 2x - 6 = 02x = 6x = 3
2) 12 + 3x = 03x = -12x = -4
3) -x + 7 = 0-x = -7x = 7
Ответ: x = 3, x = -4, x = 7.
1) 2x - 6 = 0
2x = 6
x = 3
2) 12 + 3x = 0
3x = -12
x = -4
3) -x + 7 = 0
-x = -7
x = 7
Ответ: x = 3, x = -4, x = 7.