$\frac {3(2 \sqrt 5 - \sqrt 7) - 2(2 \sqrt 5 - \sqrt 7)}{20 - 7}$
$\frac {6\sqrt 5 + 3\sqrt 7 + 4 \sqrt 5 + 2\sqrt 7}{13}$
$\frac {2 \sqrt 5 - \sqrt 7}{13}$
raphael answered the question on December 24, 2016 at 07:22
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