SOLUTION: Can you please show how to collect like terms? Thanks. 12m+3n-9m-7n

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Question 432464: Can you please show how to collect like terms? Thanks.
12m+3n-9m-7n
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Simply rearrange all the "m" terms together and all the "n" terms together:

12m + 3n - 9m - 7n

= (12m - 9m) + (3n - 7n)

= 3m - 4n