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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = 6/12 // - 6/12
9/x-(6/12) = 0
9/x-1/2 = 0
9*x^-1 = 1/2 // : 9
x^-1 = 1/18
-1 < 0
1/(x^1) = 1/18 // * x^1
1 = 1/18*x^1 // : 1/18
18 = x^1
x = 18
x = 18
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