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-15=1-1n-3n
We move all terms to the left:
-15-(1-1n-3n)=0
We add all the numbers together, and all the variables
-(-4n+1)-15=0
We get rid of parentheses
4n-1-15=0
We add all the numbers together, and all the variables
4n-16=0
We move all terms containing n to the left, all other terms to the right
4n=16
n=16/4
n=4
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