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s in (-oo:+oo)
24/28 = s/42 // - s/42
24/28-(s/42) = 0
6/7-1/42*s = 0 // - 6/7
-1/42*s = -6/7 // : -1/42
s = -6/7/(-1/42)
s = 36
s = 36
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