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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
5/13 = 6/X // - 6/X
5/13-(6/X) = 0
5/13-6*X^-1 = 0
-6*X^-1 = -5/13 // : -6
X^-1 = 5/78
-1 < 0
1/(X^1) = 5/78 // * X^1
1 = 5/78*X^1 // : 5/78
78/5 = X^1
X = 78/5
X = 78/5
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