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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 0.5/3 // - 0.5/3
6/x-(0.5/3) = 0
6/x-0.16666667 = 0
6*x^-1 = 0.16666667 // : 6
x^-1 = 0.02777778
-1 < 0
1/(x^1) = 0.02777778 // * x^1
1 = 0.02777778*x^1 // : 0.02777778
35.99999712 = x^1
x = 35.99999712
x = 35.99999712
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