21=3(a+6)

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Solution for 21=3(a+6) equation: 



21=3(a+6)

We move all terms to the left:

21-(3(a+6))=0



We calculate terms in parentheses: -(3(a+6)), so:

3(a+6)

We multiply parentheses

3a+18

Back to the equation:

-(3a+18)



We get rid of parentheses

-3a-18+21=0

We add all the numbers together, and all the variables

-3a+3=0

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

-3a=-3

a=-3/-3

a=1

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