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