#### Answer

$-\frac{1}{7}$

#### Work Step by Step

$-\frac{2}{7}\times(\frac{1}{5}+\frac{3}{10})$
$=-\frac{2}{7}\times(\frac{2}{10}+\frac{3}{10})$
$=-\frac{2}{7}\times\frac{1}{2}$
$=-(\frac{2}{7}\times\frac{1}{2})$
$=-(\frac{1}{7}\times\frac{1}{1})$
$=-\frac{1}{7}$