Answer
$40-x=10$
Work Step by Step
Let x represent "a number". "Difference" tells us the operation is subtraction. "Is" tells us to put an equal sign between the expression before "is" and the expression after "is".
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 1 - Section 1.1 - Introduction to Algebra: Variables and Mathematical Models - Exercise Set - Page 11: 64
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