(8-9y)y=-40+(6-3y)(6+3y)
8y-9y(квадрат)=-40+(36-9y квадрат)
8y=-40
y=-5
8y - 9y^2 = -40 + 36 - 9y
8y= -40 +36
8y= -4
y= -1/2
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8y-9y(квадрат)=-40+(36-9y квадрат)
8y=-40
y=-5
8y - 9y^2 = -40 + 36 - 9y
8y= -40 +36
8y= -4
y= -1/2