Answer
$\frac{w}{10}$
Work Step by Step
In order to add or subtract fractions, we start by making a common denominator (bottom of the fraction). Thus, we multiply w/5 by 2/2 (this is legal because 2/2 equals one) to obtain:
$\frac{2w}{10}$+(-$\frac{w}{10}$)=$\frac{w}{10}$
(Recall, adding a negative is the same as subtraction.)
