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s in (-oo:+oo)
9/28 = s/42 // - s/42
9/28-(s/42) = 0
9/28-1/42*s = 0 // - 9/28
-1/42*s = -9/28 // : -1/42
s = -9/28/(-1/42)
s = 27/2
s = 27/2
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