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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 13/5 // - 13/5
7/x-(13/5) = 0
7/x-13/5 = 0
7*x^-1 = 13/5 // : 7
x^-1 = 13/35
-1 < 0
1/(x^1) = 13/35 // * x^1
1 = 13/35*x^1 // : 13/35
35/13 = x^1
x = 35/13
x = 35/13
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