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9x-6x+204=9x+78
We move all terms to the left:
9x-6x+204-(9x+78)=0
We add all the numbers together, and all the variables
3x-(9x+78)+204=0
We get rid of parentheses
3x-9x-78+204=0
We add all the numbers together, and all the variables
-6x+126=0
We move all terms containing x to the left, all other terms to the right
-6x=-126
x=-126/-6
x=+21
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