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-9(n+42)=81
We move all terms to the left:
-9(n+42)-(81)=0
We multiply parentheses
-9n-378-81=0
We add all the numbers together, and all the variables
-9n-459=0
We move all terms containing n to the left, all other terms to the right
-9n=459
n=459/-9
n=-51
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