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9(n+3)-9(n+8)=6(n-11)-7(n-3
We move all terms to the left:
9(n+3)-9(n+8)-(6(n-11)-7(n-3)=0
We multiply parentheses
9n-9n-(6(n-11)-7(n-3)+27-72=0
We add all the numbers together, and all the variables
-(6(n-11)-7(n-3)+27-72=0
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