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w in (-oo:+oo)
w/20 = 4/16 // - 4/16
w/20-(4/16) = 0
w/20-1/4 = 0
1/20*w-1/4 = 0 // + 1/4
1/20*w = 1/4 // : 1/20
w = 1/4/1/20
w = 5
w = 5
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