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D( x )
x = 0
x+1 = 0
x = 0
x = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:0) U (0:+oo)
(2*x)/(x+1) = (2*x-1)/x // - (2*x-1)/x
(2*x)/(x+1)-((2*x-1)/x) = 0
(2*x)/(x+1)+(-1*(2*x-1))/x = 0
(2*x*x)/(x*(x+1))+(-1*(2*x-1)*(x+1))/(x*(x+1)) = 0
2*x*x-1*(2*x-1)*(x+1) = 0
1-x = 0
(1-x)/(x*(x+1)) = 0
(1-x)/(x*(x+1)) = 0 // * x*(x+1)
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x = 1
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