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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
6/56 = 27/X // - 27/X
6/56-(27/X) = 0
6/56-27*X^-1 = 0
-27*X^-1 = -3/28 // : -27
X^-1 = 1/252
-1 < 0
1/(X^1) = 1/252 // * X^1
1 = 1/252*X^1 // : 1/252
252 = X^1
X = 252
X = 252
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