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s in (-oo:+oo)
(1/8)*(s+18) = 7 // - 7
(1/8)*(s+18)-7 = 0
1/8*(s+18)-7 = 0
1/8*(s+18)-7 = 0
1/8*s-19/4 = 0
1/8*s-19/4 = 0
1/8*s-19/4 = 0 // + 19/4
1/8*s = 19/4 // : 1/8
s = 19/4/1/8
s = 38
s = 38
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