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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1/6 = 144/X // - 144/X
1/6-(144/X) = 0
1/6-144*X^-1 = 0
-144*X^-1 = -1/6 // : -144
X^-1 = 1/864
-1 < 0
1/(X^1) = 1/864 // * X^1
1 = 1/864*X^1 // : 1/864
864 = X^1
X = 864
X = 864
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