21=n+54/9

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Solution for 21=n+54/9 equation: 



21=n+54/9

We move all terms to the left:

21-(n+54/9)=0

We add all the numbers together, and all the variables

-(n+6)+21=0

We get rid of parentheses

-n-6+21=0

We add all the numbers together, and all the variables

-1n+15=0

We move all terms containing n to the left, all other terms to the right

-n=-15

n=-15/-1

n=+15

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