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thangvegeta1604

$\frac{1}{5}.\frac{2}{7}-\frac{1}{3}.\frac{2}{7}-\frac{1}{3}.\frac{3}{9}+\frac{1}{5}.\frac{3}{9}$
=$\frac{2}{7}.\frac{-2}{15}-\frac{1}{3}.\frac{-2}{15}$
=$\frac{-2}{15}.\frac{-1}{21}=\frac{2}{315}$
 
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