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u in (-oo:+oo)
(3/2)*u-(2/5) = -u-(4/5) // + -u-(4/5)
(3/2)*u+u-(2/5)+4/5 = 0
(3/2)*u+u-2/5+4/5 = 0
5/2*u+2/5 = 0 // - 2/5
5/2*u = -2/5 // : 5/2
u = -2/5/5/2
u = -4/25
u = -4/25
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