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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
113 = 10/X // - 10/X
113-(10/X) = 0
113-10*X^-1 = 0
-10*X^-1 = -113 // : -10
X^-1 = 113/10
-1 < 0
1/(X^1) = 113/10 // * X^1
1 = 113/10*X^1 // : 113/10
10/113 = X^1
X = 10/113
X = 10/113
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