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y in (-oo:+oo)
200*y-((200/200)*y) = 0.4 // - 0.4
200*y-((200/200)*y)-0.4 = 0
200*y-y-0.4 = 0
199*y-0.4 = 0 // + 0.4
199*y = 0.4 // : 199
y = 0.4/199
y = 0.00201005
y = 0.00201005
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