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w in (-oo:+oo)
w/4-1 = 8-(w/2) // - 8-(w/2)
w/4+w/2-8-1 = 0
3/4*w-9 = 0 // + 9
3/4*w = 9 // : 3/4
w = 9/3/4
w = 12
w = 12
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