Answer: 30k-24m
Explanation:
so 9(2k-3m), there is an invisible multipulaction sign between the 9 and the parenthesis which means you have to multiply everything in there. 18k-27m.
Then -9m+12m+12k. Its a plus because two minuses make a positive.
18k-27m-9m+12m+12k. Now you put like terms together.
18+12k=30k, -27m-9m+12m= -24m
30k-24m