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u in (-oo:+oo)
u-((1/8)*u)+7/8 = (-1/4)*(u-(3/4)) // - (-1/4)*(u-(3/4))
u-((-1/4)*(u-(3/4)))-((1/8)*u)+7/8 = 0
(1/4)*(u-3/4)+u+(-1/8)*u+7/8 = 0
1/4*(u-3/4)+u-u/8+7/8 = 0
(1/4*8*(u-3/4))/8+(8*u)/8-u/8+7/8 = 0
1/4*8*(u-3/4)+8*u-u+7 = 0
10*u-u-3/2+7 = 0
9*u-3/2+7 = 0
9*u+11/2 = 0
(9*u+11/2)/8 = 0
(9*u+11/2)/8 = 0 // * 8
9*u+11/2 = 0
9*u+11/2 = 0 // - 11/2
9*u = -11/2 // : 9
u = -11/2/9
u = -11/18
u = -11/18
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