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-- The perimeter is (2 lengths) plus (2 widths).

-- You know the width, so you can subtract it from the perimeter twice.

-- When you do that, the number you have left will be (2 lengths).

-- Surely you can handle it from here.

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Whichever way you choose to solve this problem,

you must also carry out this final step:

-- If your solution is not ' 7 ', then go back to Step-1, rinse, and repeat.

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