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Set up the prolem as x + 9 = 16 (with x representing the unknown number) and solve:

x + 9 = 16 (then subtract 9 from each side of the equation to solve for x)

x = 7

Prove the answer by substiting 7 for x:

x + 9 = 16

7 + 9 = 16

16 = 16

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โˆ™ 2010-03-16 19:45:06
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Algebra

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Q: The sum of a number and 9 is 16. find the number?
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