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s in (-oo:+oo)
s/12 = 21/2 // - 21/2
s/12-(21/2) = 0
s/12-21/2 = 0
1/12*s-21/2 = 0 // + 21/2
1/12*s = 21/2 // : 1/12
s = 21/2/1/12
s = 126
s = 126
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