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