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u in (-oo:+oo)
28 = (-4/5)*u // - (-4/5)*u
28-((-4/5)*u) = 0
(4/5)*u+28 = 0
4/5*u+28 = 0 // - 28
4/5*u = -28 // : 4/5
u = -28/4/5
u = -35
u = -35
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