4n=21+2.5n

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Solution for 4n=21+2.5n equation: 



4n=21+2.5n

We move all terms to the left:

4n-(21+2.5n)=0

We add all the numbers together, and all the variables

4n-(2.5n+21)=0

We get rid of parentheses

4n-2.5n-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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