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s in (-oo:+oo)
7-(s/2) > 3 // - 3
7-(s/2)-3 > 0
4-1/2*s > 0 // - 4
-1/2*s > -4 // : -1/2
s < -4/(-1/2)
s < 8
s in (-oo:8)
(-oo:8)
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