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D( x )
1-x = 0
x+1 = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:1) U (1:+oo)
-2 = 1/(x+1)-(3/(1-x)) // - 1/(x+1)-(3/(1-x))
3/(1-x)-(1/(x+1))-2 = 0
3/(1-x)-(x+1)^-1-2 = 0
3/(1-x)-1/(x+1)-2 = 0
(-1*(1-x))/((x+1)*(1-x))+(3*(x+1))/((x+1)*(1-x))+(-2*(x+1)*(1-x))/((x+1)*(1-x)) = 0
3*(x+1)-1*(1-x)-2*(x+1)*(1-x) = 0
2*x^2+4*x-2+2 = 0
2*x^2+4*x = 0
2*x^2+4*x = 0
2*x*(x+2) = 0
x+2 = 0 // - 2
x = -2
2*x*(x+2) = 0
(2*x*(x+2))/((x+1)*(1-x)) = 0
(2*x*(x+2))/((x+1)*(1-x)) = 0 // * (x+1)*(1-x)
2*x*(x+2) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x+2 )
x+2 = 0 // - 2
x = -2
x in { 0, -2 }
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