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