-9(a-1)=-3(-3a-9)

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Solution for -9(a-1)=-3(-3a-9) equation: 



-9(a-1)=-3(-3a-9)

We move all terms to the left:

-9(a-1)-(-3(-3a-9))=0

We multiply parentheses

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



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

-3(-3a-9)

We multiply parentheses

9a+27

Back to the equation:

-(9a+27)



We get rid of parentheses

-9a-9a-27+9=0

We add all the numbers together, and all the variables

-18a-18=0

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

-18a=18

a=18/-18

a=-1

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