-81=-3(3a+6)

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Solution for -81=-3(3a+6) equation: 



-81=-3(3a+6)

We move all terms to the left:

-81-(-3(3a+6))=0



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

-3(3a+6)

We multiply parentheses

-9a-18

Back to the equation:

-(-9a-18)



We get rid of parentheses

9a+18-81=0

We add all the numbers together, and all the variables

9a-63=0

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

9a=63

a=63/9

a=7

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