Answer
$-\dfrac{20}{21}$
Work Step by Step
Make the fractions similar using their LCD, which is $21$:
$=-\dfrac{2(7)}{3(7)}+\left(-\dfrac{2(3)}{7(3)}\right)
\\=-\dfrac{14}{21}+\left(-\dfrac{6}{21}\right)
\\=\dfrac{-14-6}{21}
\\=-\dfrac{20}{21}$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 2 - Section 2.4 - Signed Fractions - Exercises - Page 118: 2
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