1) 12 - 3(x-5) = 6
12 - 3x + 15 = 6-3x + 27 = 6-3x = -21x = 7
Ответ: x = 7
2) 12 + 3(x+7) = 57
12 + 3x + 21 = 573x + 33 = 573x = 24x = 8
Ответ: x = 8
3) 9(x+3) - 12 = 60
9x + 27 - 12 = 609x + 15 = 609x = 45x = 5
Ответ: x = 5
1) 12 - 3(x-5) = 6
12 - 3x + 15 = 6
-3x + 27 = 6
-3x = -21
x = 7
Ответ: x = 7
2) 12 + 3(x+7) = 57
12 + 3x + 21 = 57
3x + 33 = 57
3x = 24
x = 8
Ответ: x = 8
3) 9(x+3) - 12 = 60
9x + 27 - 12 = 60
9x + 15 = 60
9x = 45
x = 5
Ответ: x = 5