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y in (-oo:+oo)
8/20 = y/100 // - y/100
8/20-(y/100) = 0
2/5-1/100*y = 0 // - 2/5
-1/100*y = -2/5 // : -1/100
y = -2/5/(-1/100)
y = 40
y = 40
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