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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/113 = 15/x // - 15/x
11/113-(15/x) = 0
11/113-15*x^-1 = 0
-15*x^-1 = -11/113 // : -15
x^-1 = 11/1695
-1 < 0
1/(x^1) = 11/1695 // * x^1
1 = 11/1695*x^1 // : 11/1695
1695/11 = x^1
x = 1695/11
x = 1695/11
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