9-3a=-3(4+8a)

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Solution for 9-3a=-3(4+8a) equation: 



9-3a=-3(4+8a)

We move all terms to the left:

9-3a-(-3(4+8a))=0

We add all the numbers together, and all the variables

-3a-(-3(8a+4))+9=0



We calculate terms in parentheses: -(-3(8a+4)), so:

-3(8a+4)

We multiply parentheses

-24a-12

Back to the equation:

-(-24a-12)



We get rid of parentheses

-3a+24a+12+9=0

We add all the numbers together, and all the variables

21a+21=0

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

21a=-21

a=-21/21

a=-1

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