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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
3*X-((4*X)/X)-(4/3)-4 = X // - X
3*X-X-((4*X)/X)-(4/3)-4 = 0
3*X-X-4/3-4-4 = 0
2*X-28/3 = 0 // + 28/3
2*X = 28/3 // : 2
X = 28/3/2
X = 14/3
X = 14/3
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