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u in (-oo:+oo)
(1/2)*u-(4/5) = 3/5-5*u // - 3/5-5*u
(1/2)*u-(-5*u)-(4/5)-(3/5) = 0
(1/2)*u+5*u-4/5-3/5 = 0
11/2*u-7/5 = 0 // + 7/5
11/2*u = 7/5 // : 11/2
u = 7/5/11/2
u = 14/55
u = 14/55
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