\(\frac{5}{21}=\frac{3}{21}+\frac{2}{21}=\frac{1}{7}+\frac{1}{21}+\frac{1}{21}\)
\(\frac{5}{21}=\frac{3}{21}+\frac{2}{21}=\frac{1}{7}+\frac{1}{21}+\frac{1}{21}\)
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