Answer
$$-\frac{1}{42}.$$
Work Step by Step
We simplify by removing the parenthesis and add the terms as follows:
$$
\left( -\frac{6}{7} \right)-\left( -\frac{5}{-6} \right)= -\frac{6}{7}+\frac{5}{6}\\
=\frac{-36+35}{42}=-\frac{1}{42}.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 2 - Review - Page 133: 21
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