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3n+20=4n+12
We move all terms to the left:
3n+20-(4n+12)=0
We get rid of parentheses
3n-4n-12+20=0
We add all the numbers together, and all the variables
-1n+8=0
We move all terms containing n to the left, all other terms to the right
-n=-8
n=-8/-1
n=+8
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