2n-21=9n

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Solution for 2n-21=9n equation: 



2n-21=9n

We move all terms to the left:

2n-21-(9n)=0

We add all the numbers together, and all the variables

-7n-21=0

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

-7n=21

n=21/-7

n=-3

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