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u in (-oo:+oo)
(1/8)*u-(5/8) = (5/2)*u+7/8 // - (5/2)*u+7/8
(1/8)*u-((5/2)*u)-(5/8)-(7/8) = 0
(1/8)*u+(-5/2)*u-5/8-7/8 = 0
-19/8*u-3/2 = 0 // + 3/2
-19/8*u = 3/2 // : -19/8
u = 3/2/(-19/8)
u = -12/19
u = -12/19
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