Posted by **Lisa** on Sunday, April 19, 2009 at 12:20am.

Here is the problem I am working on and what I did so far:

4+m-3m

First I did this:

4+(m-3m)

Then I did this:

4+(-2m)

I thought my answer should be:

4-2m

The answer key says the answer should be:

-2m+4

What did I do wrong?

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