-9=2(r+10)-9

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Solution for -9=2(r+10)-9 equation: 



-9=2(r+10)-9

We move all terms to the left:

-9-(2(r+10)-9)=0



We calculate terms in parentheses: -(2(r+10)-9), so:

2(r+10)-9

We multiply parentheses

2r+20-9

We add all the numbers together, and all the variables

2r+11

Back to the equation:

-(2r+11)



We get rid of parentheses

-2r-11-9=0

We add all the numbers together, and all the variables

-2r-20=0

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

-2r=20

r=20/-2

r=-10

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