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-33=-7n-12
We move all terms to the left:
-33-(-7n-12)=0
We get rid of parentheses
7n+12-33=0
We add all the numbers together, and all the variables
7n-21=0
We move all terms containing n to the left, all other terms to the right
7n=21
n=21/7
n=3
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