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D( x )
x-2 = 0
x+2 = 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 in (-oo:-2) U (-2:2) U (2:+oo)
2/(x+2)-(3/(x-2)) = 0
2/(x+2)-3*(x-2)^-1 = 0
2/(x+2)-3/(x-2) = 0
(2*(x-2))/((x+2)*(x-2))+(-3*(x+2))/((x+2)*(x-2)) = 0
2*(x-2)-3*(x+2) = 0
-x-10 = 0
(-x-10)/((x+2)*(x-2)) = 0
(-x-10)/((x+2)*(x-2)) = 0 // * (x+2)*(x-2)
-x-10 = 0
-x-10 = 0 // + 10
-x = 10 // * -1
x = -10
x = -10
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