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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+1/3 = 5/6 // - 5/6
6/x+1/3-(5/6) = 0
6/x+1/3-5/6 = 0
6*x^-1 = 1/2 // : 6
x^-1 = 1/12
-1 < 0
1/(x^1) = 1/12 // * x^1
1 = 1/12*x^1 // : 1/12
12 = x^1
x = 12
x = 12
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