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3x+x=x+9
We move all terms to the left:
3x+x-(x+9)=0
We add all the numbers together, and all the variables
4x-(x+9)=0
We get rid of parentheses
4x-x-9=0
We add all the numbers together, and all the variables
3x-9=0
We move all terms containing x to the left, all other terms to the right
3x=9
x=9/3
x=3
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