Answer
$\{7\}$.
Work Step by Step
The given equation is
$3x=21$
Divide both sides by $3$.
$\dfrac{3x}{3}=\dfrac{21}{3}$
Simplify.
$x=7$
Hence, the solution to the equation is $\{7\}$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Appendix A - Review - A.6 Solving Equations - A.6 Assess Your Understanding - Page A51: 15
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