Пошаговое объяснение:
85 - (2х + 5) = 70
85 - 2х - 5 = 70
80 - 2х = 70
- 2х = 70 - 80
- 2х = - 10
х=5
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Пошаговое объяснение:
85 - (2х + 5) = 70
85 - 2х - 5 = 70
80 - 2х = 70
- 2х = 70 - 80
- 2х = - 10
х=5