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\begin{array}{r}\frac{9}{10} \\ +\frac{2}{3} \\ \end{array} \begin{array}{r}5\frac{3}{5} \\ +3\frac{3}{4} \\ \end{array} \begin{array}{r}\frac{3}{5} \\ -\frac{1}{5} \\ \end{array} \begin{array}{c}

12 \\

-2 \frac{2}{5}

\end{array}

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