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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
5/X = 4/120 // - 4/120
5/X-(4/120) = 0
5/X-1/30 = 0
5*X^-1 = 1/30 // : 5
X^-1 = 1/150
-1 < 0
1/(X^1) = 1/150 // * X^1
1 = 1/150*X^1 // : 1/150
150 = X^1
X = 150
X = 150
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