21=9-3a

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Solution for 21=9-3a equation: 



21=9-3a

We move all terms to the left:

21-(9-3a)=0

We add all the numbers together, and all the variables

-(-3a+9)+21=0

We get rid of parentheses

3a-9+21=0

We add all the numbers together, and all the variables

3a+12=0

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

3a=-12

a=-12/3

a=-4

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