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s in (-oo:+oo)
7-s = (18*s)/9 // - (18*s)/9
7-s-((18*s)/9) = 0
7-s-2*s = 0
7-3*s = 0 // - 7
-3*s = -7 // : -3
s = -7/(-3)
s = 7/3
s = 7/3
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