-81=-3(3+3r)

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Solution for -81=-3(3+3r) equation: 



-81=-3(3+3r)

We move all terms to the left:

-81-(-3(3+3r))=0

We add all the numbers together, and all the variables

-(-3(3r+3))-81=0



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

-3(3r+3)

We multiply parentheses

-9r-9

Back to the equation:

-(-9r-9)



We get rid of parentheses

9r+9-81=0

We add all the numbers together, and all the variables

9r-72=0

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

9r=72

r=72/9

r=8

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