use the distributive property using the numbers 7,8 and 9.
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7(8 + 9) = 7*8 + 7*9 = 56 + 63 = 119  this is distributive property.  the number is multiplied across both of the inside number.

7(8 + 9) = 7 * 17 = 119  this is using PEMDAS rule.
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