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s in (-oo:+oo)
6 = 8*s-(3/4)-20 // - 8*s-(3/4)-20
3/4-(8*s)+6+20 = 0
3/4-8*s+6+20 = 0
107/4-8*s = 0 // - 107/4
-8*s = -107/4 // : -8
s = -107/4/(-8)
s = 107/32
s = 107/32
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