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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 16/13 // - 16/13
7/x-(16/13) = 0
7/x-16/13 = 0
7*x^-1 = 16/13 // : 7
x^-1 = 16/91
-1 < 0
1/(x^1) = 16/91 // * x^1
1 = 16/91*x^1 // : 16/91
91/16 = x^1
x = 91/16
x = 91/16
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