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s in (-oo:+oo)
(1/2)*s = 4*s-21 // - 4*s-21
(1/2)*s-(4*s)+21 = 0
(1/2)*s-4*s+21 = 0
21-7/2*s = 0 // - 21
-7/2*s = -21 // : -7/2
s = -21/(-7/2)
s = 6
s = 6
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