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s in (-oo:+oo)
s/3 = 7/9 // - 7/9
s/3-(7/9) = 0
s/3-7/9 = 0
1/3*s-7/9 = 0 // + 7/9
1/3*s = 7/9 // : 1/3
s = 7/9/1/3
s = 7/3
s = 7/3
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