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6(n+4)+3(3n+3)=63
We move all terms to the left:
6(n+4)+3(3n+3)-(63)=0
We multiply parentheses
6n+9n+24+9-63=0
We add all the numbers together, and all the variables
15n-30=0
We move all terms containing n to the left, all other terms to the right
15n=30
n=30/15
n=2
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