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s in (-oo:+oo)
7/9 = s/27 // - s/27
7/9-(s/27) = 0
7/9-1/27*s = 0 // - 7/9
-1/27*s = -7/9 // : -1/27
s = -7/9/(-1/27)
s = 21
s = 21
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