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How would I factorise the perimeter?

How would I factorise the perimeter?-example-1

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If one side is five then the two unknown sides will be 3 and 2. Then add all the sides together as shown in the picture. Then factorise the equation you will get 2(7+x)
How would I factorise the perimeter?-example-1
User Tomasz Siorek
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