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204=6x+12
We move all terms to the left:
204-(6x+12)=0
We get rid of parentheses
-6x-12+204=0
We add all the numbers together, and all the variables
-6x+192=0
We move all terms containing x to the left, all other terms to the right
-6x=-192
x=-192/-6
x=+32
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