Решение и ответ:
x - (2x + 2) = x - 7
x - 2x - 2 = x - 7
x - 2x - 2 - x = -7
x - 2x - x -2 = -7
x - 2x - x = -7 + 2
-x - x = -5
-2x = -5
x = -5 : (-2)
x = 2.5
проверка:
2.5 - (2·2.5 + 2) = 2.5 - 7
2.5 - (5 + 2) = -4.5
2.5 - 7 = -4.5
-4.5 = -4.5 ВЕРНО
Решение и ответ:
x - (2x + 2) = x - 7
x - 2x - 2 = x - 7
x - 2x - 2 - x = -7
x - 2x - x -2 = -7
x - 2x - x = -7 + 2
-x - x = -5
-2x = -5
x = -5 : (-2)
x = 2.5
проверка:
x - (2x + 2) = x - 7
2.5 - (2·2.5 + 2) = 2.5 - 7
2.5 - (5 + 2) = -4.5
2.5 - 7 = -4.5
-4.5 = -4.5 ВЕРНО