1) 12 - 3(x-5) = 6
12 - 3x + 15 = -3x + 27 = -3x = -2x = 7
Ответ: x = 7
2) 12 + 3(x+7) = 57
12 + 3x + 21 = 53x + 33 = 53x = 2x = 8
Ответ: x = 8
3) 9(x+3) - 12 = 60
9x + 27 - 12 = 69x + 15 = 69x = 4x = 5
Ответ: x = 5
1) 12 - 3(x-5) = 6
12 - 3x + 15 =
-3x + 27 =
-3x = -2
x = 7
Ответ: x = 7
2) 12 + 3(x+7) = 57
12 + 3x + 21 = 5
3x + 33 = 5
3x = 2
x = 8
Ответ: x = 8
3) 9(x+3) - 12 = 60
9x + 27 - 12 = 6
9x + 15 = 6
9x = 4
x = 5
Ответ: x = 5