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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
38/7182 = 100/x // - 100/x
38/7182-(100/x) = 0
38/7182-100*x^-1 = 0
-100*x^-1 = -1/189 // : -100
x^-1 = 1/18900
-1 < 0
1/(x^1) = 1/18900 // * x^1
1 = 1/18900*x^1 // : 1/18900
18900 = x^1
x = 18900
x = 18900
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