81=-3(3r-6)

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



81=-3(3r-6)

We move all terms to the left:

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



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

-3(3r-6)

We multiply parentheses

-9r+18

Back to the equation:

-(-9r+18)



We get rid of parentheses

9r-18+81=0

We add all the numbers together, and all the variables

9r+63=0

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

9r=-63

r=-63/9

r=-7

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