n-12=-2n+21

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Solution for n-12=-2n+21 equation: 



n-12=-2n+21

We move all terms to the left:

n-12-(-2n+21)=0

We get rid of parentheses

n+2n-21-12=0

We add all the numbers together, and all the variables

3n-33=0

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

3n=33

n=33/3

n=11

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