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3(2n+7)=9
We move all terms to the left:
3(2n+7)-(9)=0
We multiply parentheses
6n+21-9=0
We add all the numbers together, and all the variables
6n+12=0
We move all terms containing n to the left, all other terms to the right
6n=-12
n=-12/6
n=-2
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