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s in (-oo:+oo)
(5/6)*s-(2/3) = 0
(5/6)*s-2/3 = 0
5/6*s-2/3 = 0 // + 2/3
5/6*s = 2/3 // : 5/6
s = 2/3/5/6
s = 4/5
s = 4/5
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