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s in (-oo:+oo)
s+(21/2)*s+10 = 38 // - 38
s+(21/2)*s-38+10 = 0
23/2*s-28 = 0 // + 28
23/2*s = 28 // : 23/2
s = 28/23/2
s = 56/23
s = 56/23
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