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w in (-oo:+oo)
w/8 = 12.8 // - 12.8
w/8-12.8 = 0
1/8*w-12.8 = 0 // + 12.8
1/8*w = 12.8 // : 1/8
w = 12.8/1/8
w = 102.4
w = 102.4
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