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w in (-oo:+oo)
w/8-4 < -5 // + 5
w/8-4+5 < 0
1/8*w+1 < 0 // - 1
1/8*w < -1 // : 1/8
w < -1/1/8
w < -8
w in (-oo:-8)
(-oo:-8)
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