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s in (-oo:+oo)
6/9 = s/81 // - s/81
6/9-(s/81) = 0
2/3-1/81*s = 0 // - 2/3
-1/81*s = -2/3 // : -1/81
s = -2/3/(-1/81)
s = 54
s = 54
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