-2 * (-5y + 10) = -80
10y - 20 = -80
10y = -60
y = -60 : 10 = -6
Ответ: y = -6
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-2 * (-5y + 10) = -80
10y - 20 = -80
10y = -60
y = -60 : 10 = -6
Ответ: y = -6