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s in (-oo:+oo)
s+(5/2)*s+20 = 41 // - 41
s+(5/2)*s-41+20 = 0
7/2*s-21 = 0 // + 21
7/2*s = 21 // : 7/2
s = 21/7/2
s = 6
s = 6
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