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D( x )
x-7 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x in (-oo:7) U (7:+oo)
((2*x-3)*(x+5))/(x-7) = 0
( 2*x-3 )
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
( x+5 )
x+5 = 0 // - 5
x = -5
x in { 3/2, -5 }
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