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s in (-oo:+oo)
5/8 = s/12 // - s/12
5/8-(s/12) = 0
5/8-1/12*s = 0 // - 5/8
-1/12*s = -5/8 // : -1/12
s = -5/8/(-1/12)
s = 15/2
s = 15/2
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