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s in (-oo:+oo)
(2*s)/9+(3*s)/18 = 14 // - 14
(2*s)/9+(3*s)/18-14 = 0
7/18*s-14 = 0 // + 14
7/18*s = 14 // : 7/18
s = 14/7/18
s = 36
s = 36
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