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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
719.17*(0.8/x) = 10933.67 // - 10933.67
719.17*(0.8/x)-10933.67 = 0
575.336*x^-1 = 10933.67 // : 575.336
x^-1 = 19.00397333
-1 < 0
1/(x^1) = 19.00397333 // * x^1
1 = 19.00397333*x^1 // : 19.00397333
0.05262057 = x^1
x = 0.05262057
x = 0.05262057
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