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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