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3n=n-5
We move all terms to the left:
3n-(n-5)=0
We get rid of parentheses
3n-n+5=0
We add all the numbers together, and all the variables
2n+5=0
We move all terms containing n to the left, all other terms to the right
2n=-5
n=-5/2
n=-2+1/2
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