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