Find the sum. 13 (9-6m) + 14 (12m-8)

To do this problem, we must first distribute the 13 and 14 into the parenthesis.

13 (9-6m) + 14 (12m-8)

117 - 78m + 168m - 112

To combine like terms, we can add/subtract terms that have an "m" together and then we can add/subtract terms that do not have "m" together.

117 - 112 = 5

and

168m - 78m = 90m

So our final sum is 5 + 90m

13 (9-6m) + 14 (12m-8)

117 - 78m + 168m - 112

(117 - 112) + (168m - 78m)

5 + 90m