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6(n+6)+3(7-2n)=57
We move all terms to the left:
6(n+6)+3(7-2n)-(57)=0
We add all the numbers together, and all the variables
6(n+6)+3(-2n+7)-57=0
We multiply parentheses
6n-6n+36+21-57=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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