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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
516/X = 6 // - 6
516/X-6 = 0
516*X^-1 = 6 // : 516
X^-1 = 1/86
-1 < 0
1/(X^1) = 1/86 // * X^1
1 = 1/86*X^1 // : 1/86
86 = X^1
X = 86
X = 86
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