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4x-12=12x-4x
We move all terms to the left:
4x-12-(12x-4x)=0
We add all the numbers together, and all the variables
4x-(+8x)-12=0
We get rid of parentheses
4x-8x-12=0
We add all the numbers together, and all the variables
-4x-12=0
We move all terms containing x to the left, all other terms to the right
-4x=12
x=12/-4
x=-3
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