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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(3*X+1)/X = 1/X // - 1/X
(3*X+1)/X-(1/X) = 0
(3*X+1)/X-X^-1 = 0
(3*X+1)/X-1/X = 0
3*X-1+1 = 0
3*X = 0
(3*X)/X = 0
(3*X)/X = 0 // * X
3*X = 0
3*X = 0 // : 3
X = 0
X in { 0}
X belongs to the empty set
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