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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
((2*x-5)*(x+3))/(x-2) = 0
( 2*x-5 )
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
( x+3 )
x+3 = 0 // - 3
x = -3
x in { 5/2, -3 }
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