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s in (-oo:+oo)
(5/7)*s-((3/7)*s) = 18 // - 18
(5/7)*s-((3/7)*s)-18 = 0
(5/7)*s+(-3/7)*s-18 = 0
2/7*s-18 = 0 // + 18
2/7*s = 18 // : 2/7
s = 18/2/7
s = 63
s = 63
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