![1 \div (14 - r)(13 - r) = 18 \div 7 1 \div (14 - r)(13 - r) = 18 \div 7](https://tex.z-dn.net/?f=1+%5Cdiv+%2814+-+r%29%2813+-+r%29+%3D+18+%5Cdiv+7)
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