Answer
$\left(-\infty,\frac{3}{2}\right]$
Work Step by Step
$12-x\geq 7x$ (Add $x$)
$12\geq 8x$ (Divide by 8)
$\frac{12}{8}\geq x$
$x\leq \frac{12}{8}$
$x\leq \frac{3}{2}$
The solution is $\left(-\infty,\frac{3}{2}\right]$.
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 1, Equations and Graphs - Chapter 1 Review - Exercises - Page 170: 80
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