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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(20000-x)/x = 2/100 // - 2/100
(20000-x)/x-(2/100) = 0
(20000-x)/x-1/50 = 0
(50*(20000-x))/(50*x)+(-1*x)/(50*x) = 0
50*(20000-x)-1*x = 0
1000000-51*x = 0
(1000000-51*x)/(50*x) = 0
(1000000-51*x)/(50*x) = 0 // * 50*x
1000000-51*x = 0
1000000-51*x = 0 // - 1000000
-51*x = -1000000 // : -51
x = -1000000/(-51)
x = 1000000/51
x = 1000000/51
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