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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
555/x = 11 // - 11
555/x-11 = 0
555*x^-1 = 11 // : 555
x^-1 = 11/555
-1 < 0
1/(x^1) = 11/555 // * x^1
1 = 11/555*x^1 // : 11/555
555/11 = x^1
x = 555/11
x = 555/11
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