7a-(21-3a)=9a-(3a+33)

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Solution for 7a-(21-3a)=9a-(3a+33) equation: 



7a-(21-3a)=9a-(3a+33)

We move all terms to the left:

7a-(21-3a)-(9a-(3a+33))=0

We add all the numbers together, and all the variables

7a-(-3a+21)-(9a-(3a+33))=0

We get rid of parentheses

7a+3a-(9a-(3a+33))-21=0



We calculate terms in parentheses: -(9a-(3a+33)), so:

9a-(3a+33)

We get rid of parentheses

9a-3a-33

We add all the numbers together, and all the variables

6a-33

Back to the equation:

-(6a-33)



We add all the numbers together, and all the variables

10a-(6a-33)-21=0

We get rid of parentheses

10a-6a+33-21=0

We add all the numbers together, and all the variables

4a+12=0

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

4a=-12

a=-12/4

a=-3

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