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12+4x=8x-4
We move all terms to the left:
12+4x-(8x-4)=0
We get rid of parentheses
4x-8x+4+12=0
We add all the numbers together, and all the variables
-4x+16=0
We move all terms containing x to the left, all other terms to the right
-4x=-16
x=-16/-4
x=+4
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