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9x+x+2x-x-7x+2=14

We move all terms to the left:

9x+x+2x-x-7x+2-(14)=0

We add all the numbers together, and all the variables

4x-12=0

We move all terms containing x to the left, all other terms to the right

4x=12

x=12/4

x=3

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