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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=

• Pre Algebra 7th Grade -

• Pre Algebra 7th Grade -

Oh sorry that is what it said but what you put was right

Thank you =]

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