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