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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
12-8*s+20 = 0
32-8*s = 0
32-8*s = 0
32-8*s = 0 // - 32
-8*s = -32 // : -8
s = -32/(-8)
s = 4
s = 4
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