-166=8(7r-5)+7r

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Solution for -166=8(7r-5)+7r equation: 



-166=8(7r-5)+7r

We move all terms to the left:

-166-(8(7r-5)+7r)=0



We calculate terms in parentheses: -(8(7r-5)+7r), so:

8(7r-5)+7r

We add all the numbers together, and all the variables

7r+8(7r-5)

We multiply parentheses

7r+56r-40

We add all the numbers together, and all the variables

63r-40

Back to the equation:

-(63r-40)



We get rid of parentheses

-63r+40-166=0

We add all the numbers together, and all the variables

-63r-126=0

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

-63r=126

r=126/-63

r=-2

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