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s in (-oo:+oo)
6/7 = s/14 // - s/14
6/7-(s/14) = 0
6/7-1/14*s = 0 // - 6/7
-1/14*s = -6/7 // : -1/14
s = -6/7/(-1/14)
s = 12
s = 12
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