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D( x )
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x in (-oo:-1/3) U (-1/3:+oo)
(2*x+5)/(3*x+1) = 0
2*x+5 = 0 // - 5
2*x = -5 // : 2
x = -5/2
x = -5/2
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