Answer
-19/72
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 5/18 by 4/4 and 13/24 by 3/3 to obtain:
$\frac{20}{72}$-($\frac{39}{72}$)=-$\frac{19}{72}$.
