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3x+9=2x+x-12
We move all terms to the left:
3x+9-(2x+x-12)=0
We add all the numbers together, and all the variables
3x-(3x-12)+9=0
We get rid of parentheses
3x-3x+12+9=0
We add all the numbers together, and all the variables
21!=0
There is no solution for this equation
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