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D( x )
x-2 = 0
x+2 = 0
x = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x = 0
x = 0
x in (-oo:-2) U (-2:0) U (0:2) U (2:+oo)
3/(x+2)-(1/(x-2)) = 2/x // - 2/x
3/(x+2)-(1/(x-2))-(2/x) = 0
3/(x+2)-(x-2)^-1-2*x^-1 = 0
3/(x+2)-1/(x-2)-2/x = 0
(3*x*(x-2))/(x*(x+2)*(x-2))+(-1*x*(x+2))/(x*(x+2)*(x-2))+(-2*(x+2)*(x-2))/(x*(x+2)*(x-2)) = 0
3*x*(x-2)-1*x*(x+2)-2*(x+2)*(x-2) = 0
2*x^2-2*x^2-8*x+8 = 0
8-8*x = 0
(8-8*x)/(x*(x+2)*(x-2)) = 0
(8-8*x)/(x*(x+2)*(x-2)) = 0 // * x*(x+2)*(x-2)
8-8*x = 0
8-8*x = 0 // - 8
-8*x = -8 // : -8
x = -8/(-8)
x = 1
x = 1
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