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4(1+7n)+8n=220
We move all terms to the left:
4(1+7n)+8n-(220)=0
We add all the numbers together, and all the variables
4(7n+1)+8n-220=0
We add all the numbers together, and all the variables
8n+4(7n+1)-220=0
We multiply parentheses
8n+28n+4-220=0
We add all the numbers together, and all the variables
36n-216=0
We move all terms containing n to the left, all other terms to the right
36n=216
n=216/36
n=6
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