a=21+8a

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Solution for a=21+8a equation: 



a=21+8a

We move all terms to the left:

a-(21+8a)=0

We add all the numbers together, and all the variables

a-(8a+21)=0

We get rid of parentheses

a-8a-21=0

We add all the numbers together, and all the variables

-7a-21=0

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

-7a=21

a=21/-7

a=-3

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