Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 2 - Solving Equations - 2-3 Solving Multi-Step Equations - Mixed Review: 74

Answer

$a=4$

Work Step by Step

We start with the given equation: $-3a+21=9$ We subtract $21$ from both sides of the equation: $-3a+21-21=9-21$ We combine like terms on both sides of the equation: $-3a=-12$ We divide by $-3$ on both sides of the equation: $a=\frac{-12}{-3}=4$
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