Algebra 1

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

Chapter 1 - Foundations for Algebra - 1-8 An Introduction to Equations - Lesson Check - Page 56: 2



Work Step by Step

We are supposed to use mental math to solve this problem. We cancel out subtraction using addition, so we add 3 to both sides. We recall that 12+3 equals 15, so x=15.
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