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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-500)/x = 0.33 // - 0.33
(x-500)/x-0.33 = 0
(x-500)/x+(-0.33*x)/x = 0
x-0.33*x-500 = 0
0.67*x-500 = 0
(0.67*x-500)/x = 0
(0.67*x-500)/x = 0 // * x
0.67*x-500 = 0
0.67*x-500 = 0 // + 500
0.67*x = 500 // : 0.67
x = 500/0.67
x = 746.26865672
x = 746.26865672
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