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-63=3n-15
We move all terms to the left:
-63-(3n-15)=0
We get rid of parentheses
-3n+15-63=0
We add all the numbers together, and all the variables
-3n-48=0
We move all terms containing n to the left, all other terms to the right
-3n=48
n=48/-3
n=-16
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