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s in (-oo:+oo)
s+(5/2)*s+20 = 48 // - 48
s+(5/2)*s-48+20 = 0
7/2*s-28 = 0 // + 28
7/2*s = 28 // : 7/2
s = 28/7/2
s = 8
s = 8
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