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s in (-oo:+oo)
47 = (31/2)*s+s+20 // - (31/2)*s+s+20
47-((31/2)*s)-s-20 = 0
(-31/2)*s-s-20+47 = 0
27-33/2*s = 0 // - 27
-33/2*s = -27 // : -33/2
s = -27/(-33/2)
s = 18/11
s = 18/11
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