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