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There are an infinite number of pairs whose difference is $-9$.
$0-9=-9$
$1-10=-9$
$2-11=-9$
One example of two numbers whose difference is $-9$ are $0$ and $-9$.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 1 - Section 1.5 - Subtracting Real Numbers - Exercise Set - Page 48: 96
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