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20+55n=100+35n
We move all terms to the left:
20+55n-(100+35n)=0
We add all the numbers together, and all the variables
55n-(35n+100)+20=0
We get rid of parentheses
55n-35n-100+20=0
We add all the numbers together, and all the variables
20n-80=0
We move all terms containing n to the left, all other terms to the right
20n=80
n=80/20
n=4
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