-21=7(3+6a)

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Solution for -21=7(3+6a) equation: 



-21=7(3+6a)

We move all terms to the left:

-21-(7(3+6a))=0

We add all the numbers together, and all the variables

-(7(6a+3))-21=0



We calculate terms in parentheses: -(7(6a+3)), so:

7(6a+3)

We multiply parentheses

42a+21

Back to the equation:

-(42a+21)



We get rid of parentheses

-42a-21-21=0

We add all the numbers together, and all the variables

-42a-42=0

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

-42a=42

a=42/-42

a=-1

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