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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13/x = 11/7 // - 11/7
13/x-(11/7) = 0
13/x-11/7 = 0
13*x^-1 = 11/7 // : 13
x^-1 = 11/91
-1 < 0
1/(x^1) = 11/91 // * x^1
1 = 11/91*x^1 // : 11/91
91/11 = x^1
x = 91/11
x = 91/11
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