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s in (-oo:+oo)
(21/3)*s+(2/3)*s = 6 // - 6
(21/3)*s+(2/3)*s-6 = 0
23/3*s-6 = 0 // + 6
23/3*s = 6 // : 23/3
s = 6/23/3
s = 18/23
s = 18/23
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