-7=2(r-8)-9

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Solution for -7=2(r-8)-9 equation: 



-7=2(r-8)-9

We move all terms to the left:

-7-(2(r-8)-9)=0



We calculate terms in parentheses: -(2(r-8)-9), so:

2(r-8)-9

We multiply parentheses

2r-16-9

We add all the numbers together, and all the variables

2r-25

Back to the equation:

-(2r-25)



We get rid of parentheses

-2r+25-7=0

We add all the numbers together, and all the variables

-2r+18=0

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

-2r=-18

r=-18/-2

r=+9

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