-122=-2(1-8r)-r

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Solution for -122=-2(1-8r)-r equation: 



-122=-2(1-8r)-r

We move all terms to the left:

-122-(-2(1-8r)-r)=0

We add all the numbers together, and all the variables

-(-2(-8r+1)-r)-122=0



We calculate terms in parentheses: -(-2(-8r+1)-r), so:

-2(-8r+1)-r

We add all the numbers together, and all the variables

-1r-2(-8r+1)

We multiply parentheses

-1r+16r-2

We add all the numbers together, and all the variables

15r-2

Back to the equation:

-(15r-2)



We get rid of parentheses

-15r+2-122=0

We add all the numbers together, and all the variables

-15r-120=0

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

-15r=120

r=120/-15

r=-8

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