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D( x )
6*x+5 = 0
6*x+5 = 0
6*x+5 = 0
6*x+5 = 0 // - 5
6*x = -5 // : 6
x = -5/6
x in (-oo:-5/6) U (-5/6:+oo)
(3*x+1)/(6*x+5) = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x = -1/3
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