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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
3/7 = 6/X // - 6/X
3/7-(6/X) = 0
3/7-6*X^-1 = 0
-6*X^-1 = -3/7 // : -6
X^-1 = 1/14
-1 < 0
1/(X^1) = 1/14 // * X^1
1 = 1/14*X^1 // : 1/14
14 = X^1
X = 14
X = 14
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