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D( x )
200-(x/100) = 0
200-(x/100) = 0
200-(x/100) = 0
200-1/100*x = 0 // - 200
-1/100*x = -200 // : -1/100
x = -200/(-1/100)
x = 20000
x in (-oo:20000) U (20000:+oo)
(x/80)/(200-(x/100)) = 0
(1/80*x)/(200-1/100*x) = 0
1/80*x = 0 // : 1/80
x = 0
x = 0
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