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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)
(6*x+7)/(2*x-3) = 0
6*x+7 = 0 // - 7
6*x = -7 // : 6
x = -7/6
x = -7/6
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