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D( x )
x-2 = 0
x+3 = 0
2*x-4 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in (-oo:-3) U (-3:2) U (2:+oo)
(((X+2)/(x+3))/(2*x-4))/(x-2) = 0
(X+2)/((x+3)*(2*x-4)*(x-2)) = 0
x belongs to the empty set
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