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20=4-2n
We move all terms to the left:
20-(4-2n)=0
We add all the numbers together, and all the variables
-(-2n+4)+20=0
We get rid of parentheses
2n-4+20=0
We add all the numbers together, and all the variables
2n+16=0
We move all terms containing n to the left, all other terms to the right
2n=-16
n=-16/2
n=-8
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