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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 5/6 // - 5/6
2/x-(5/6) = 0
2/x-5/6 = 0
2*x^-1 = 5/6 // : 2
x^-1 = 5/12
-1 < 0
1/(x^1) = 5/12 // * x^1
1 = 5/12*x^1 // : 5/12
12/5 = x^1
x = 12/5
x = 12/5
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