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