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4(n+3)+2(3n+1)=18
We move all terms to the left:
4(n+3)+2(3n+1)-(18)=0
We multiply parentheses
4n+6n+12+2-18=0
We add all the numbers together, and all the variables
10n-4=0
We move all terms containing n to the left, all other terms to the right
10n=4
n=4/10
n=2/5
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