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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
99/162 = 13/x // - 13/x
99/162-(13/x) = 0
99/162-13*x^-1 = 0
-13*x^-1 = -11/18 // : -13
x^-1 = 11/234
-1 < 0
1/(x^1) = 11/234 // * x^1
1 = 11/234*x^1 // : 11/234
234/11 = x^1
x = 234/11
x = 234/11
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