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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 6/69 // - 6/69
2/x-(6/69) = 0
2/x-2/23 = 0
2*x^-1 = 2/23 // : 2
x^-1 = 1/23
-1 < 0
1/(x^1) = 1/23 // * x^1
1 = 1/23*x^1 // : 1/23
23 = x^1
x = 23
x = 23
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