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3(n+7)=28
We move all terms to the left:
3(n+7)-(28)=0
We multiply parentheses
3n+21-28=0
We add all the numbers together, and all the variables
3n-7=0
We move all terms containing n to the left, all other terms to the right
3n=7
n=7/3
n=2+1/3
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