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w in (-oo:+oo)
w/8-13 > -6 // + 6
w/8-13+6 > 0
1/8*w-7 > 0 // + 7
1/8*w > 7 // : 1/8
w > 7/1/8
w > 56
w in (56:+oo)
(56:+oo)
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