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4x-12=8x+9-4x=
We move all terms to the left:
4x-12-(8x+9-4x)=0
We add all the numbers together, and all the variables
4x-(4x+9)-12=0
We get rid of parentheses
4x-4x-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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