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3(x-4)=2x+9+x
We move all terms to the left:
3(x-4)-(2x+9+x)=0
We add all the numbers together, and all the variables
3(x-4)-(3x+9)=0
We multiply parentheses
3x-(3x+9)-12=0
We get rid of parentheses
3x-3x-9-12=0
We add all the numbers together, and all the variables
-21!=0
There is no solution for this equation
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