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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

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



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

3(3a+3)

We multiply parentheses

9a+9

Back to the equation:

-(9a+9)



We get rid of parentheses

-9a-9a-9-9=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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