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8n+(-2n+3)=12
We move all terms to the left:
8n+(-2n+3)-(12)=0
We get rid of parentheses
8n-2n+3-12=0
We add all the numbers together, and all the variables
6n-9=0
We move all terms containing n to the left, all other terms to the right
6n=9
n=9/6
n=1+1/2
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