21-6n+3n-9=57

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Solution for 21-6n+3n-9=57 equation: 



21-6n+3n-9=57

We move all terms to the left:

21-6n+3n-9-(57)=0

We add all the numbers together, and all the variables

-3n-45=0

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

-3n=45

n=45/-3

n=-15

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