Solve: $\frac{21}{20} + (- \frac{19}{30})$

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Solution

$\frac{21}{20} + (- \frac{19}{30}) = \frac{21}{20} - \frac{19}{30}$

$= \frac{1}{10} (\frac{21}{2} - \frac{19}{3})$

$= \frac{1}{10} (\frac{63 - 38}{6})$

$= \frac{1}{10} (\frac{25}{6})$

$= \frac{5}{12}$

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