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n+4(2n+3)=21
We move all terms to the left:
n+4(2n+3)-(21)=0
We multiply parentheses
n+8n+12-21=0
We add all the numbers together, and all the variables
9n-9=0
We move all terms containing n to the left, all other terms to the right
9n=9
n=9/9
n=1
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