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