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D( x )
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
x in (-oo:3/2) U (3/2:+oo)
(50*x)/(2*x-3) = 0
50*x = 0 // : 50
x = 0
x = 0
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