Answer
$-\frac{131}{225}$
Work Step by Step
$(\frac{2}{3})(\frac{-1}{3}) - (\frac{9}{10})(\frac{2}{5})$
$= \frac{-2}{9} - \frac{18}{50}$
$= \frac{-2}{9} - \frac{9}{25}$
$= \frac{-50}{225} - \frac{81}{225}$
$=-\frac{131}{225}$
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