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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-1)/(3*x+5) = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x = 1/2
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