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6+2n=5n+15
We move all terms to the left:
6+2n-(5n+15)=0
We get rid of parentheses
2n-5n-15+6=0
We add all the numbers together, and all the variables
-3n-9=0
We move all terms containing n to the left, all other terms to the right
-3n=9
n=9/-3
n=-3
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