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s in (-oo:+oo)
6 = 8*(s+3/4)-20 // - 8*(s+3/4)-20
6-(8*(s+3/4))+20 = 0
6-8*(s+3/4)+20 = 0
6-8*(s+3/4)+20 = 0
20-8*s = 0
20-8*s = 0
20-8*s = 0 // - 20
-8*s = -20 // : -8
s = -20/(-8)
s = 5/2
s = 5/2
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