Answer
$-\frac{3}{7}$
Work Step by Step
$-\frac{5}{14}+\frac{3}{7}-\frac{1}{2}$
LCD=14
$-\frac{5}{14}+\frac{3}{7}\times\frac{2}{2}-\frac{1}{2}\times\frac{7}{7}$
$-\frac{5}{14}+\frac{6}{14}-\frac{7}{14}$
$\frac{-5+6-7}{14}$
$-\frac{6}{14}$
$-\frac{3}{7}$