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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/54 = 9/x // - 9/x
6/54-(9/x) = 0
6/54-9*x^-1 = 0
-9*x^-1 = -1/9 // : -9
x^-1 = 1/81
-1 < 0
1/(x^1) = 1/81 // * x^1
1 = 1/81*x^1 // : 1/81
81 = x^1
x = 81
x = 81
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