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5n=7+4n
We move all terms to the left:
5n-(7+4n)=0
We add all the numbers together, and all the variables
5n-(4n+7)=0
We get rid of parentheses
5n-4n-7=0
We add all the numbers together, and all the variables
n-7=0
We move all terms containing n to the left, all other terms to the right
n=7
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