Answer
-1/6
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 -3/14 by 3/3 and 1/21 by 2/2 to obtain:
-$\frac{9}{42}$+($\frac{2}{42}$)=-$\frac{7}{42}=-1/6$.
