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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3 = 100-(13/x) // - 100-(13/x)
13/x-100+3 = 0
13*x^-1 = 97 // : 13
x^-1 = 97/13
-1 < 0
1/(x^1) = 97/13 // * x^1
1 = 97/13*x^1 // : 97/13
13/97 = x^1
x = 13/97
x = 13/97
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