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