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u in (-oo:+oo)
-3 = (-3/5)*u // - (-3/5)*u
-((-3/5)*u)-3 = 0
(3/5)*u-3 = 0
3/5*u-3 = 0 // + 3
3/5*u = 3 // : 3/5
u = 3/3/5
u = 5
u = 5
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