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D( u )
u-5 = 0
u-5 = 0
u-5 = 0
u-5 = 0 // + 5
u = 5
u in (-oo:5) U (5:+oo)
-8 = 3/(u-5) // - 3/(u-5)
-(3/(u-5))-8 = 0
-3*(u-5)^-1-8 = 0
-3/(u-5)-8 = 0
(-8*(u-5))/(u-5)-3/(u-5) = 0
-8*(u-5)-3 = 0
37-8*u = 0
(37-8*u)/(u-5) = 0
(37-8*u)/(u-5) = 0 // * u-5
37-8*u = 0
37-8*u = 0 // - 37
-8*u = -37 // : -8
u = -37/(-8)
u = 37/8
u = 37/8
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