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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
27/4.04 = 2720/x // - 2720/x
27/4.04-(2720/x) = 0
27/4.04-2720*x^-1 = 0
-2720*x^-1 = -6.68316832 // : -2720
x^-1 = 0.00245705
-1 < 0
1/(x^1) = 0.00245705 // * x^1
1 = 0.00245705*x^1 // : 0.00245705
406.9921247 = x^1
x = 406.9921247
x = 406.9921247
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