Answer
x=15
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.
Algebra 1
by Hall, Prentice
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
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