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-15-3n=4n-2n
We move all terms to the left:
-15-3n-(4n-2n)=0
We add all the numbers together, and all the variables
-3n-(+2n)-15=0
We get rid of parentheses
-3n-2n-15=0
We add all the numbers together, and all the variables
-5n-15=0
We move all terms containing n to the left, all other terms to the right
-5n=15
n=15/-5
n=-3
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