-81=-5(-8r-6)+9

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Solution for -81=-5(-8r-6)+9 equation: 



-81=-5(-8r-6)+9

We move all terms to the left:

-81-(-5(-8r-6)+9)=0



We calculate terms in parentheses: -(-5(-8r-6)+9), so:

-5(-8r-6)+9

We multiply parentheses

40r+30+9

We add all the numbers together, and all the variables

40r+39

Back to the equation:

-(40r+39)



We get rid of parentheses

-40r-39-81=0

We add all the numbers together, and all the variables

-40r-120=0

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

-40r=120

r=120/-40

r=-3

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