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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
430/x = 0.08 // - 0.08
430/x-0.08 = 0
430*x^-1 = 0.08 // : 430
x^-1 = 0.00018605
-1 < 0
1/(x^1) = 0.00018605 // * x^1
1 = 0.00018605*x^1 // : 0.00018605
5374.89922064 = x^1
x = 5374.89922064
x = 5374.89922064
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