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w in (-oo:+oo)
w/8-3-2 = 7/8 // - 7/8
w/8-(7/8)-3-2 = 0
w/8-7/8-3-2 = 0
1/8*w-47/8 = 0 // + 47/8
1/8*w = 47/8 // : 1/8
w = 47/8/1/8
w = 47
w = 47
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