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s in (-oo:+oo)
s+(31/2)*s = 27 // - 27
s+(31/2)*s-27 = 0
33/2*s-27 = 0 // + 27
33/2*s = 27 // : 33/2
s = 27/33/2
s = 18/11
s = 18/11
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