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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-1)/2-x^-1 = 12 // - 12
(x^-1)/2-x^-1-12 = 0
-1/2*x^-1 = 12 // : -1/2
x^-1 = -24
-1 < 0
1/(x^1) = -24 // * x^1
1 = -24*x^1 // : -24
-1/24 = x^1
x = -1/24
x = -1/24
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