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u in (-oo:+oo)
-4/5 = (-4/3)*u-(1/2) // - (-4/3)*u-(1/2)
1/2-((-4/3)*u)-4/5 = 0
(4/3)*u-4/5+1/2 = 0
4/3*u-3/10 = 0 // + 3/10
4/3*u = 3/10 // : 4/3
u = 3/10/4/3
u = 9/40
u = 9/40
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