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8-2x=12+4x
We move all terms to the left:
8-2x-(12+4x)=0
We add all the numbers together, and all the variables
-2x-(4x+12)+8=0
We get rid of parentheses
-2x-4x-12+8=0
We add all the numbers together, and all the variables
-6x-4=0
We move all terms containing x to the left, all other terms to the right
-6x=4
x=4/-6
x=-2/3
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