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3x-12+4x=6x+x
We move all terms to the left:
3x-12+4x-(6x+x)=0
We add all the numbers together, and all the variables
3x+4x-(+7x)-12=0
We add all the numbers together, and all the variables
7x-(+7x)-12=0
We get rid of parentheses
7x-7x-12=0
We add all the numbers together, and all the variables
-12!=0
There is no solution for this equation
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