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2x+x+x+9=x2x+12
We move all terms to the left:
2x+x+x+9-(x2x+12)=0
We add all the numbers together, and all the variables
4x-(x2x+12)+9=0
We get rid of parentheses
4x-x2x-12+9=0
We add all the numbers together, and all the variables
4x-x2x-3=0
We move all terms containing x to the left, all other terms to the right
4x-x2x=3
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