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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/30 = 82/x // - 82/x
X/30-(82/x) = 0
X/30-82*x^-1 = 0
-82*x^-1 = -(1/30*X) // : -82
x^-1 = 1/2460*X
-1 < 0
1/(x^1) = 1/2460*X // * x^1
1 = 1/2460*X*x^1 // : 1/2460*X
2460*X^-1 = x^1
x = 2460*X^-1
x = 2460*X^-1
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