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