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Dobbs · Answer 1 · 2016-08-10T15:02:05+0000

You said that S = 2(lw + lh + wh)

Divide each side by 2 : S/2 = lw + lh + wh

Subtract 'lh' from each side: S/2 - lh = lw + wh

Factor the right side: S/2 - lh = w(l + h)

Divide each side by (l + h) : (S/2 - lh) / (l + h) = w

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