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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(31/3)/x = 1/6 // - 1/6
(31/3)/x-(1/6) = 0
(31/3)/x-1/6 = 0
31/3*x^-1 = 1/6 // : 31/3
x^-1 = 1/62
-1 < 0
1/(x^1) = 1/62 // * x^1
1 = 1/62*x^1 // : 1/62
62 = x^1
x = 62
x = 62
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