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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 530 // - 530
1/x-530 = 0
1*x^-1 = 530 // : 1
x^-1 = 530
-1 < 0
1/(x^1) = 530 // * x^1
1 = 530*x^1 // : 530
1/530 = x^1
x = 1/530
x = 1/530
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