21=n-12

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Solution for 21=n-12 equation: 



21=n-12

We move all terms to the left:

21-(n-12)=0

We get rid of parentheses

-n+12+21=0

We add all the numbers together, and all the variables

-1n+33=0

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

-n=-33

n=-33/-1

n=+33

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