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