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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.12/x = 14.08 // - 14.08
0.12/x-14.08 = 0
0.12*x^-1 = 14.08 // : 0.12
x^-1 = 117.33333333
-1 < 0
1/(x^1) = 117.33333333 // * x^1
1 = 117.33333333*x^1 // : 117.33333333
0.00852273 = x^1
x = 0.00852273
x = 0.00852273
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