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w in (-oo:+oo)
w/8 = 25/20 // - 25/20
w/8-(25/20) = 0
w/8-5/4 = 0
1/8*w-5/4 = 0 // + 5/4
1/8*w = 5/4 // : 1/8
w = 5/4/1/8
w = 10
w = 10
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