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s in (-oo:+oo)
(1/2)*s = 45-21 // - 45-21
(1/2)*s-45+21 = 0
1/2*s-24 = 0 // + 24
1/2*s = 24 // : 1/2
s = 24/1/2
s = 48
s = 48
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