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w in (-oo:+oo)
w/4-(3/20) = w/5 // - w/5
w/4-(w/5)-(3/20) = 0
w/4-(w/5)-3/20 = 0
1/20*w-3/20 = 0 // + 3/20
1/20*w = 3/20 // : 1/20
w = 3/20/1/20
w = 3
w = 3
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