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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 8/12 // - 8/12
6/x-(8/12) = 0
6/x-2/3 = 0
6*x^-1 = 2/3 // : 6
x^-1 = 1/9
-1 < 0
1/(x^1) = 1/9 // * x^1
1 = 1/9*x^1 // : 1/9
9 = x^1
x = 9
x = 9
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