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4(2n+1)=28
We move all terms to the left:
4(2n+1)-(28)=0
We multiply parentheses
8n+4-28=0
We add all the numbers together, and all the variables
8n-24=0
We move all terms containing n to the left, all other terms to the right
8n=24
n=24/8
n=3
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