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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = 1/18 // - 1/18
9/x-(1/18) = 0
9/x-1/18 = 0
9*x^-1 = 1/18 // : 9
x^-1 = 1/162
-1 < 0
1/(x^1) = 1/162 // * x^1
1 = 1/162*x^1 // : 1/162
162 = x^1
x = 162
x = 162
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