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y in (-oo:+oo)
-8 = (-4/5)*y // - (-4/5)*y
-((-4/5)*y)-8 = 0
(4/5)*y-8 = 0
4/5*y-8 = 0 // + 8
4/5*y = 8 // : 4/5
y = 8/4/5
y = 10
y = 10
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