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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)
3-(5/(u-5)) = (5/(u-5))*(u-2) // - (5/(u-5))*(u-2)
3-(5/(u-5))-((5/(u-5))*(u-2)) = 0
3-5*(u-5)^-1-5*(u-5)^-1*(u-2) = 0
(-5*(u-2))/(u-5)-5/(u-5)+3 = 0
(-5*(u-2))/(u-5)-5/(u-5)+(3*(u-5))/(u-5) = 0
3*(u-5)-5*(u-2)-5 = 0
3*u-5*u-15+5 = 0
-2*u-10 = 0
(-2*u-10)/(u-5) = 0
(-2*u-10)/(u-5) = 0 // * u-5
-2*u-10 = 0
-2*u-10 = 0 // + 10
-2*u = 10 // : -2
u = 10/(-2)
u = -5
u = -5
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