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3x+15=12-3+3x
We move all terms to the left:
3x+15-(12-3+3x)=0
We add all the numbers together, and all the variables
3x-(3x+9)+15=0
We get rid of parentheses
3x-3x-9+15=0
We add all the numbers together, and all the variables
6!=0
There is no solution for this equation
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