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s in (-oo:+oo)
3*s = 7/9 // - 7/9
3*s-(7/9) = 0
3*s-7/9 = 0
3*s-7/9 = 0 // + 7/9
3*s = 7/9 // : 3
s = 7/9/3
s = 7/27
s = 7/27
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