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