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s in (-oo:+oo)
-9*s-(8/(-5)) = -20 // + 20
20-9*s-(8/(-5)) = 0
8/5-9*s+20 = 0
108/5-9*s = 0 // - 108/5
-9*s = -108/5 // : -9
s = -108/5/(-9)
s = 12/5
s = 12/5
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