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u in (-oo:+oo)
-16 = (-4/5)*u // - (-4/5)*u
-((-4/5)*u)-16 = 0
(4/5)*u-16 = 0
4/5*u-16 = 0 // + 16
4/5*u = 16 // : 4/5
u = 16/4/5
u = 20
u = 20
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