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w in (-oo:+oo)
10-((1/2)*w) > 12 // - 12
10-((1/2)*w)-12 > 0
(-1/2)*w-12+10 > 0
-1/2*w-2 > 0 // + 2
-1/2*w > 2 // : -1/2
w < 2/(-1/2)
w < -4
w in (-oo:-4)
(-oo:-4)
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