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20=12+12n
We move all terms to the left:
20-(12+12n)=0
We add all the numbers together, and all the variables
-(12n+12)+20=0
We get rid of parentheses
-12n-12+20=0
We add all the numbers together, and all the variables
-12n+8=0
We move all terms containing n to the left, all other terms to the right
-12n=-8
n=-8/-12
n=2/3
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