21=9+4a

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Solution for 21=9+4a equation: 



21=9+4a

We move all terms to the left:

21-(9+4a)=0

We add all the numbers together, and all the variables

-(4a+9)+21=0

We get rid of parentheses

-4a-9+21=0

We add all the numbers together, and all the variables

-4a+12=0

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

-4a=-12

a=-12/-4

a=+3

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