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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/3-(1/x) = 5/6 // - 5/6
2/3-(1/x)-(5/6) = 0
2/3-x^-1-5/6 = 0
-1*x^-1 = 1/6 // : -1
x^-1 = -1/6
-1 < 0
1/(x^1) = -1/6 // * x^1
1 = -1/6*x^1 // : -1/6
-6 = x^1
x = -6
x = -6
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