21=12-3n

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Solution for 21=12-3n equation: 



21=12-3n

We move all terms to the left:

21-(12-3n)=0

We add all the numbers together, and all the variables

-(-3n+12)+21=0

We get rid of parentheses

3n-12+21=0

We add all the numbers together, and all the variables

3n+9=0

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

3n=-9

n=-9/3

n=-3

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