Two squares have sides \( x \mathrm{~cm} \) and \( (x+4) \mathrm{cm} \). The sum of their areas ...

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Two squares have sides \( x \mathrm{~cm} \) and \( (x+4) \mathrm{cm} \). The sum of their areas is \( 656 \mathrm{~cm}^{2} \). Find the sides of the squares.
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