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s in (-oo:+oo)
((2/1)/3)*s+(2/3)*s = 6 // - 6
((2/1)/3)*s+(2/3)*s-6 = 0
(2/3)*s+(2/3)*s-6 = 0
4/3*s-6 = 0 // + 6
4/3*s = 6 // : 4/3
s = 6/4/3
s = 9/2
s = 9/2
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