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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
561/x = 11 // - 11
561/x-11 = 0
561*x^-1 = 11 // : 561
x^-1 = 1/51
-1 < 0
1/(x^1) = 1/51 // * x^1
1 = 1/51*x^1 // : 1/51
51 = x^1
x = 51
x = 51
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