Answer: 9(7 - 3)
In other words,
- 9 goes in the first box
- 7 in the second box
- 3 in the third box.
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Step-by-step explanation:
Factor 63 and 27 such that the GCF 9 is involved.
So,
63 - 27 = 9*7 - 9*3 = 9(7 - 3)
I used the distributive rule.