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s in (-oo:+oo)
(1/2)*(s+5) = 10 // - 10
(1/2)*(s+5)-10 = 0
1/2*(s+5)-10 = 0
1/2*(s+5)-10 = 0
1/2*s-15/2 = 0
1/2*s-15/2 = 0
1/2*s-15/2 = 0 // + 15/2
1/2*s = 15/2 // : 1/2
s = 15/2/1/2
s = 15
s = 15
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