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3x-21=x+7
We move all terms to the left:
3x-21-(x+7)=0
We get rid of parentheses
3x-x-7-21=0
We add all the numbers together, and all the variables
2x-28=0
We move all terms containing x to the left, all other terms to the right
2x=28
x=28/2
x=14
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