-81=-3(6+3x)

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



-81=-3(6+3x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-3(3x+6)

We multiply parentheses

-9x-18

Back to the equation:

-(-9x-18)



We get rid of parentheses

9x+18-81=0

We add all the numbers together, and all the variables

9x-63=0

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

9x=63

x=63/9

x=7

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