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Rectangles with ......

.........re that a !!6×3!! rectan...

She had already ..... that; she wrote $$(L×W) = ([L+W]×2).$$ I remember.....solve the equation for !!W!!, getting !!W!! on one side and a bunch of stuff involving !!L!! on the other, but........, eventually obtaining $$W = 2L\div (L-2).$$ I woul.......ng.