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