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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
56.5 = 8.34*(3800/x) // - 8.34*(3800/x)
56.5-(8.34*(3800/x)) = 0
56.5-31692*x^-1 = 0
-31692*x^-1 = -56.5 // : -31692
x^-1 = 0.00178278
-1 < 0
1/(x^1) = 0.00178278 // * x^1
1 = 0.00178278*x^1 // : 0.00178278
560.92170655 = x^1
x = 560.92170655
x = 560.92170655
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