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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/13 = 7/x // - 7/x
6/13-(7/x) = 0
6/13-7*x^-1 = 0
-7*x^-1 = -6/13 // : -7
x^-1 = 6/91
-1 < 0
1/(x^1) = 6/91 // * x^1
1 = 6/91*x^1 // : 6/91
91/6 = x^1
x = 91/6
x = 91/6
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