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2n-21=n/3
We move all terms to the left:
2n-21-(n/3)=0
We add all the numbers together, and all the variables
2n-(+n/3)-21=0
We get rid of parentheses
2n-n/3-21=0
We multiply all the terms by the denominator
2n*3-n-21*3=0
We add all the numbers together, and all the variables
-1n+2n*3-63=0
Wy multiply elements
-1n+6n-63=0
We add all the numbers together, and all the variables
5n-63=0
We move all terms containing n to the left, all other terms to the right
5n=63
n=63/5
n=12+3/5
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