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s in (-oo:+oo)
s+(21/2)*s+10 = 52 // - 52
s+(21/2)*s-52+10 = 0
23/2*s-42 = 0 // + 42
23/2*s = 42 // : 23/2
s = 42/23/2
s = 84/23
s = 84/23
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