Answer
All real numbers
Work Step by Step
12x-4+8x-4=4(5x-2)
12x-4+8x-4=4(5x)-4(2)
12x-4+8x-4=20x-8
(12x+8x)+(-4-4)=20x-8
20x-8=20x-8
20x-20x-8=-8
0-8=-8
-8=-8
Therefore, this equation is true for all real numbers.
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 2 - Mid-Chapter Check Point - Page 155: 18
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