Answer
$\frac{4}{35}a$
Work Step by Step
We first apply the distributive property. Then, we simplify the resultant expression:
$\frac{2}{5}a-\frac{2}{7}a$
=$a(\frac{2}{5}-\frac{2}{7})$
=$a(\frac{2(7)-2(5)}{35})$
=$a(\frac{14-10}{35})$
=$a(\frac{4}{35})$
=$\frac{4}{35}a$
