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D( x )
x+1 = 0
5*x-1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
x in (-oo:-1) U (-1:1/5) U (1/5:+oo)
3/(x+1) = 6/(5*x-1) // - 6/(5*x-1)
3/(x+1)-(6/(5*x-1)) = 0
3/(x+1)-6*(5*x-1)^-1 = 0
3/(x+1)-6/(5*x-1) = 0
(3*(5*x-1))/((x+1)*(5*x-1))+(-6*(x+1))/((x+1)*(5*x-1)) = 0
3*(5*x-1)-6*(x+1) = 0
9*x-9 = 0
(9*x-9)/((x+1)*(5*x-1)) = 0
(9*x-9)/((x+1)*(5*x-1)) = 0 // * (x+1)*(5*x-1)
9*x-9 = 0
9*x-9 = 0 // + 9
9*x = 9 // : 9
x = 9/9
x = 1
x = 1
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