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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
267 = (200*x-1)/x // - (200*x-1)/x
267-((200*x-1)/x) = 0
(-1*(200*x-1))/x+267 = 0
(-1*(200*x-1))/x+(267*x)/x = 0
267*x-1*(200*x-1) = 0
67*x+1 = 0
(67*x+1)/x = 0
(67*x+1)/x = 0 // * x
67*x+1 = 0
67*x+1 = 0 // - 1
67*x = -1 // : 67
x = -1/67
x = -1/67
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