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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
4/X = 150/90 // - 150/90
4/X-(150/90) = 0
4/X-5/3 = 0
4*X^-1 = 5/3 // : 4
X^-1 = 5/12
-1 < 0
1/(X^1) = 5/12 // * X^1
1 = 5/12*X^1 // : 5/12
12/5 = X^1
X = 12/5
X = 12/5
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