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D( x )
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x in (-oo:2/3) U (2/3:+oo)
(4*x+7)/(3*x-2) = 0
4*x+7 = 0 // - 7
4*x = -7 // : 4
x = -7/4
x = -7/4
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