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W in (-oo:+oo)
W/2-(3*140) = 53 // - 53
W/2-(3*140)-53 = 0
W/2-420-53 = 0
1/2*W-473 = 0 // + 473
1/2*W = 473 // : 1/2
W = 473/1/2
W = 946
W = 946
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