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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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