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