Posted by **Maria** on Thursday, September 4, 2008 at 8:44pm.

How do I simplify the following expressions by collecting like terms?

2x-9+x=?

6x-4j+3y=?

4x+15+2x-x+9+?

j-k-j+3k=

5r+3r+4rt=

7yz+yz=

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