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u in (-oo:+oo)
(1/8)*u+7/8 = (7/2)*u+5/5 // - (7/2)*u+5/5
(1/8)*u-((7/2)*u)+7/8-(5/5) = 0
(1/8)*u+(-7/2)*u+7/8-1 = 0
-27/8*u-1/8 = 0 // + 1/8
-27/8*u = 1/8 // : -27/8
u = 1/8/(-27/8)
u = -1/27
u = -1/27
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