-81=3(-6x-3)

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Solution for -81=3(-6x-3) equation: 



-81=3(-6x-3)

We move all terms to the left:

-81-(3(-6x-3))=0



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

3(-6x-3)

We multiply parentheses

-18x-9

Back to the equation:

-(-18x-9)



We get rid of parentheses

18x+9-81=0

We add all the numbers together, and all the variables

18x-72=0

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

18x=72

x=72/18

x=4

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