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12n-(6n+3)=2n+5
We move all terms to the left:
12n-(6n+3)-(2n+5)=0
We get rid of parentheses
12n-6n-2n-3-5=0
We add all the numbers together, and all the variables
4n-8=0
We move all terms containing n to the left, all other terms to the right
4n=8
n=8/4
n=2
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