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s in (-oo:+oo)
(2/3)*s-((5/6)*s)+1/2 = -2/3 // + -2/3
(2/3)*s-((5/6)*s)+1/2-(-2/3) = 0
(2/3)*s+(-5/6)*s+1/2+2/3 = 0
7/6-1/6*s = 0 // - 7/6
-1/6*s = -7/6 // : -1/6
s = -7/6/(-1/6)
s = 7
s = 7
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