-9=-3(7a+3)-7(3a+6)

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Solution for -9=-3(7a+3)-7(3a+6) equation: 



-9=-3(7a+3)-7(3a+6)

We move all terms to the left:

-9-(-3(7a+3)-7(3a+6))=0



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

-3(7a+3)-7(3a+6)

We multiply parentheses

-21a-21a-9-42

We add all the numbers together, and all the variables

-42a-51

Back to the equation:

-(-42a-51)



We get rid of parentheses

42a+51-9=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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