-21=7(3-a)

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



-21=7(3-a)

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(7(-1a+3))-21=0



We calculate terms in parentheses: -(7(-1a+3)), so:

7(-1a+3)

We multiply parentheses

-7a+21

Back to the equation:

-(-7a+21)



We get rid of parentheses

7a-21-21=0

We add all the numbers together, and all the variables

7a-42=0

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

7a=42

a=42/7

a=6

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