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4n=21+2.50n
We move all terms to the left:
4n-(21+2.50n)=0
We add all the numbers together, and all the variables
4n-(2.50n+21)=0
We get rid of parentheses
4n-2.50n-21=0
We add all the numbers together, and all the variables
1.5n-21=0
We move all terms containing n to the left, all other terms to the right
1.5n=21
n=21/1.5
n=14
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