81=-3(1+4r)

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Solution for 81=-3(1+4r) equation: 



81=-3(1+4r)

We move all terms to the left:

81-(-3(1+4r))=0

We add all the numbers together, and all the variables

-(-3(4r+1))+81=0



We calculate terms in parentheses: -(-3(4r+1)), so:

-3(4r+1)

We multiply parentheses

-12r-3

Back to the equation:

-(-12r-3)



We get rid of parentheses

12r+3+81=0

We add all the numbers together, and all the variables

12r+84=0

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

12r=-84

r=-84/12

r=-7

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