Объяснение:
5x - (7-x) = 4х – 9
5х + х - 4 х = 9 + 7
2х = 16
х = 16 : 2 = 8
5x - (7 - x) = 4x - 9
5x - 7 + x = 4x - 9
6x - 7 = 4x - 9
6x - 4x = -9 + 7
2x = -2
X = -1
Думаю так
Объяснение:
5x - (7-x) = 4х – 9
5х + х - 4 х = 9 + 7
2х = 16
х = 16 : 2 = 8
5x - (7 - x) = 4x - 9
5x - 7 + x = 4x - 9
6x - 7 = 4x - 9
6x - 4x = -9 + 7
2x = -2
X = -1
Думаю так