Answer
$-4$
Work Step by Step
Subtract $7$ to both sides to obtain:
$7-2x-7=15-7
\\-2x=8$
Divide $-2$ to both sides to obtain:
$x =\frac{8}{-2}
\\x=-4$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.8 - Solving Basic Equations - P.8 Exercises - Page 60: 17
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