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2n+20=4n+16
We move all terms to the left:
2n+20-(4n+16)=0
We get rid of parentheses
2n-4n-16+20=0
We add all the numbers together, and all the variables
-2n+4=0
We move all terms containing n to the left, all other terms to the right
-2n=-4
n=-4/-2
n=+2
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