Answer
-$\frac{3}{14}$
Work Step by Step
$\frac{27}{28}$ -$\frac{5}{28}$ -$\frac{28}{28}$
Subtract the numerator. Keep the common denominator
=$\frac{27-5-28}{28}$ =
=$\frac{-6}{28}$ =-$\frac{2\times3}{2\times14}$
= -$\frac{3}{14}$