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s in (-oo:+oo)
8/40 = s/10 // - s/10
8/40-(s/10) = 0
1/5-1/10*s = 0 // - 1/5
-1/10*s = -1/5 // : -1/10
s = -1/5/(-1/10)
s = 2
s = 2
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