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s in (-oo:+oo)
228/456 = s/12 // - s/12
228/456-(s/12) = 0
1/2-1/12*s = 0 // - 1/2
-1/12*s = -1/2 // : -1/12
s = -1/2/(-1/12)
s = 6
s = 6
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