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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.5 = (x^-1)/6 // - (x^-1)/6
0.5-((x^-1)/6) = 0
-1/6*x^-1 = -0.5 // : -1/6
x^-1 = 2.99999994
-1 < 0
1/(x^1) = 2.99999994 // * x^1
1 = 2.99999994*x^1 // : 2.99999994
0.33333334 = x^1
x = 0.33333334
x = 0.33333334
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