Answer
$3$
Work Step by Step
$12 = 4 \times x$
$\frac{12}{4} = \frac{4x}{4}$
$3 = x$
The blank is $3$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.7 - Dividing Polynomials - Exercise Set - Page 397: 47
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