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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-1)/2 = 6.67 // - 6.67
(x^-1)/2-6.67 = 0
1/2*x^-1 = 6.67 // : 1/2
x^-1 = 13.34
-1 < 0
1/(x^1) = 13.34 // * x^1
1 = 13.34*x^1 // : 13.34
0.07496252 = x^1
x = 0.07496252
x = 0.07496252
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