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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/12 = 2.5/x // - 2.5/x
1/12-(2.5/x) = 0
1/12-2.5*x^-1 = 0
-2.5*x^-1 = -1/12 // : -2.5
x^-1 = 0.03333333
-1 < 0
1/(x^1) = 0.03333333 // * x^1
1 = 0.03333333*x^1 // : 0.03333333
30.000003 = x^1
x = 30.000003
x = 30.000003
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