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n+(12-2n)=255
We move all terms to the left:
n+(12-2n)-(255)=0
We add all the numbers together, and all the variables
n+(-2n+12)-255=0
We get rid of parentheses
n-2n+12-255=0
We add all the numbers together, and all the variables
-1n-243=0
We move all terms containing n to the left, all other terms to the right
-n=243
n=243/-1
n=-243
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