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One possible system of three linear equations is below.
$x+y+z=6$
$-2x-2y-2z=-12$
$-3x-3y-3z=-18$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 9 - Section 9.1 - Solving Systems of Linear Equations in Three Variables and Problem Solving - Exercise Set - Page 641: 57
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