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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/12 = 9/x // - 9/x
1/12-(9/x) = 0
1/12-9*x^-1 = 0
-9*x^-1 = -1/12 // : -9
x^-1 = 1/108
-1 < 0
1/(x^1) = 1/108 // * x^1
1 = 1/108*x^1 // : 1/108
108 = x^1
x = 108
x = 108
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