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u in (-oo:+oo)
(11*u)/10-2 = (9*u)/8 // - (9*u)/8
(11*u)/10-((9*u)/8)-2 = 0
(11*u)/10+(-9/8)*u-2 = 0
-1/40*u-2 = 0 // + 2
-1/40*u = 2 // : -1/40
u = 2/(-1/40)
u = -80
u = -80
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