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Observe
$1 = \frac{5}{7} + \frac{3}{21}$$1 = \frac{5}{7} + \frac{6}{21}$
and rearrange.
$1 = \frac{5}{7} + \frac{3}{21}$
$1 = \frac{5}{7} + \frac{6}{21}$
