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D( x )
2*x+5 = 0
2*x+5 = 0
2*x+5 = 0
2*x+5 = 0 // - 5
2*x = -5 // : 2
x = -5/2
x in (-oo:-5/2) U (-5/2:+oo)
(3*x+4)/(2*x+5) = 0
3*x+4 = 0 // - 4
3*x = -4 // : 3
x = -4/3
x = -4/3
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