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6n+21=4n+54
We move all terms to the left:
6n+21-(4n+54)=0
We get rid of parentheses
6n-4n-54+21=0
We add all the numbers together, and all the variables
2n-33=0
We move all terms containing n to the left, all other terms to the right
2n=33
n=33/2
n=16+1/2
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