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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-3(-1a+7)

We multiply parentheses

3a-21

Back to the equation:

-(3a-21)



We get rid of parentheses

3a-3a+21-21=0

We add all the numbers together, and all the variables

=0

a=0/1

a=0

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