84=-2(6+8r)

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Solution for 84=-2(6+8r) equation: 



84=-2(6+8r)

We move all terms to the left:

84-(-2(6+8r))=0

We add all the numbers together, and all the variables

-(-2(8r+6))+84=0



We calculate terms in parentheses: -(-2(8r+6)), so:

-2(8r+6)

We multiply parentheses

-16r-12

Back to the equation:

-(-16r-12)



We get rid of parentheses

16r+12+84=0

We add all the numbers together, and all the variables

16r+96=0

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

16r=-96

r=-96/16

r=-6

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