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what do I put on the blank spots that have parenthesis and a plus sign in the middle? its number 15 that's talking about 56 and 77

what do I put on the blank spots that have parenthesis and a plus sign in the middle-example-1
User SkyDrive
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56 + 77
GCF = 7

56 + 77 = (7 * 8) + (7 * 11) =
7(8 + 11) <===

User Gudge
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