Answer
$$160a-65b-24c.$$
Work Step by Step
We simplify by adding the $a$-terms as follows
$$129a-13a+44a=160a,$$
adding the $b$-terms,
$$-13b-52b=-65b$$
adding the $c$-terms,
$$-56c+21c+11c=-24c.$$
The result is
$$160a-65b-24c.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 5 - Section 5.3 - Addition and Subtraction of Polynomials - Exercise - Page 221: 34
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