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6(3+n)=30
We move all terms to the left:
6(3+n)-(30)=0
We add all the numbers together, and all the variables
6(n+3)-30=0
We multiply parentheses
6n+18-30=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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