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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
126/X = 63 // - 63
126/X-63 = 0
126*X^-1 = 63 // : 126
X^-1 = 1/2
-1 < 0
1/(X^1) = 1/2 // * X^1
1 = 1/2*X^1 // : 1/2
2 = X^1
X = 2
X = 2
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