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s in (-oo:+oo)
s+(7/2)*s+10 = 55 // - 55
s+(7/2)*s-55+10 = 0
9/2*s-45 = 0 // + 45
9/2*s = 45 // : 9/2
s = 45/9/2
s = 10
s = 10
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