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D( x )
x+1 = 0
x-1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 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)
(x-10)/(x+1)-(x/(x-1)) = 0
(x-10)/(x+1)+(-1*x)/(x-1) = 0
((x-10)*(x-1))/((x+1)*(x-1))+(-1*x*(x+1))/((x+1)*(x-1)) = 0
(x-10)*(x-1)-1*x*(x+1) = 0
10-12*x = 0
(10-12*x)/((x+1)*(x-1)) = 0
(10-12*x)/((x+1)*(x-1)) = 0 // * (x+1)*(x-1)
10-12*x = 0
10-12*x = 0 // - 10
-12*x = -10 // : -12
x = -10/(-12)
x = 5/6
x = 5/6
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