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w in (-oo:+oo)
w/8 = 9/12 // - 9/12
w/8-(9/12) = 0
w/8-3/4 = 0
1/8*w-3/4 = 0 // + 3/4
1/8*w = 3/4 // : 1/8
w = 3/4/1/8
w = 6
w = 6
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