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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((2/3)/6)/9 = 12/x // - 12/x
((2/3)/6)/9-(12/x) = 0
((2/3)/6)/9-12*x^-1 = 0
-12*x^-1 = -1/81 // : -12
x^-1 = 1/972
-1 < 0
1/(x^1) = 1/972 // * x^1
1 = 1/972*x^1 // : 1/972
972 = x^1
x = 972
x = 972
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