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