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4x-12=x+3x-12
We move all terms to the left:
4x-12-(x+3x-12)=0
We add all the numbers together, and all the variables
4x-(4x-12)-12=0
We get rid of parentheses
4x-4x+12-12=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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