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s in (-oo:+oo)
(2/9)*(s-3) = (1/3)*(2*s+5) // - (1/3)*(2*s+5)
(2/9)*(s-3)-((1/3)*(2*s+5)) = 0
(2/9)*(s-3)+(-1/3)*(2*s+5) = 0
2/9*(s-3)-1/3*(2*s+5) = 0
2/9*(s-3)-1/3*(2*s+5) = 0
-4/9*s-7/3 = 0
-4/9*s-7/3 = 0
-4/9*s-7/3 = 0 // + 7/3
-4/9*s = 7/3 // : -4/9
s = 7/3/(-4/9)
s = -21/4
s = -21/4
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