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n-3=12+4n
We move all terms to the left:
n-3-(12+4n)=0
We add all the numbers together, and all the variables
n-(4n+12)-3=0
We get rid of parentheses
n-4n-12-3=0
We add all the numbers together, and all the variables
-3n-15=0
We move all terms containing n to the left, all other terms to the right
-3n=15
n=15/-3
n=-5
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