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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 3/36 // - 3/36
18/x-(3/36) = 0
18/x-1/12 = 0
18*x^-1 = 1/12 // : 18
x^-1 = 1/216
-1 < 0
1/(x^1) = 1/216 // * x^1
1 = 1/216*x^1 // : 1/216
216 = x^1
x = 216
x = 216
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