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u in (-oo:+oo)
(4/5)*u-(5/2) = -4/3 // + -4/3
(4/5)*u-(5/2)-(-4/3) = 0
(4/5)*u-5/2+4/3 = 0
4/5*u-7/6 = 0 // + 7/6
4/5*u = 7/6 // : 4/5
u = 7/6/4/5
u = 35/24
u = 35/24
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