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y in (-oo:+oo)
(10/9)*(9*y-81) = -10 // + 10
(10/9)*(9*y-81)+10 = 0
10/9*(9*y-81)+10 = 0
10/9*(9*y-81)+10 = 0
10*y-80 = 0
10*y-80 = 0
10*y-80 = 0 // + 80
10*y = 80 // : 10
y = 80/10
y = 8
y = 8
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