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

x+2+x=
x+x+x+4+8+x=
2x-9+x

• Pre-Algebra 7th Grade -

x+2+x= 2x + 2

x+x+x+4+8+x= 4x + 12

How would you collect the like terms for your last question?

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