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w in (-oo:+oo)
2*w-40 = 220/4 // - 220/4
2*w-(220/4)-40 = 0
2*w-55-40 = 0
2*w-95 = 0 // + 95
2*w = 95 // : 2
w = 95/2
w = 95/2
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