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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6784.7/100 = 3638.1/x // - 3638.1/x
6784.7/100-(3638.1/x) = 0
6784.7/100-3638.1*x^-1 = 0
-3638.1*x^-1 = -67.847 // : -3638.1
x^-1 = 0.01864902
-1 < 0
1/(x^1) = 0.01864902 // * x^1
1 = 0.01864902*x^1 // : 0.01864902
53.62212063 = x^1
x = 53.62212063
x = 53.62212063
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