8a=21+5a

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Solution for 8a=21+5a equation: 



8a=21+5a

We move all terms to the left:

8a-(21+5a)=0

We add all the numbers together, and all the variables

8a-(5a+21)=0

We get rid of parentheses

8a-5a-21=0

We add all the numbers together, and all the variables

3a-21=0

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

3a=21

a=21/3

a=7

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