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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 0.068 // - 0.068
1/x-0.068 = 0
1*x^-1 = 0.068 // : 1
x^-1 = 0.068
-1 < 0
1/(x^1) = 0.068 // * x^1
1 = 0.068*x^1 // : 0.068
14.70588235 = x^1
x = 14.70588235
x = 14.70588235
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