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u in (-oo:+oo)
3/5 = (u-5)/2 // - (u-5)/2
3/5-((u-5)/2) = 0
(-1*(u-5))/2+3/5 = 0
(-1*5*(u-5))/(2*5)+(2*3)/(2*5) = 0
2*3-1*5*(u-5) = 0
31-5*u = 0
(31-5*u)/(2*5) = 0
(31-5*u)/(2*5) = 0 // * 2*5
31-5*u = 0
31-5*u = 0 // - 31
-5*u = -31 // : -5
u = -31/(-5)
u = 31/5
u = 31/5
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