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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9^3)/x = 122 // - 122
(9^3)/x-122 = 0
729*x^-1 = 122 // : 729
x^-1 = 122/729
-1 < 0
1/(x^1) = 122/729 // * x^1
1 = 122/729*x^1 // : 122/729
729/122 = x^1
x = 729/122
x = 729/122
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