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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)
(4*x-9)/(2*x-3) = 0
4*x-9 = 0 // + 9
4*x = 9 // : 4
x = 9/4
x = 9/4
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