7х-15 = 5х+5(2х+1)
7x - 15 = 5x + 10x + 5
7x - 15 = 15x + 5
7x - 15x = 5 + 15
-8x = 20
x = -8/20 = -2/5
Ответ: x = -2/5
7x - 15 = 5x + 10x + 5
7x - 15 = 15x + 5
7x - 15x = 5 + 15
-8x = 20
x = -8/20 = -2/5
Ответ: x = -2/5
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