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u in (-oo:+oo)
5/6 = (u-2)/8 // - (u-2)/8
5/6-((u-2)/8) = 0
(-1*(u-2))/8+5/6 = 0
(-1*6*(u-2))/(6*8)+(5*8)/(6*8) = 0
5*8-1*6*(u-2) = 0
52-6*u = 0
(52-6*u)/(6*8) = 0
(52-6*u)/(6*8) = 0 // * 6*8
52-6*u = 0
52-6*u = 0 // - 52
-6*u = -52 // : -6
u = -52/(-6)
u = 26/3
u = 26/3
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