-88=11+9r

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Solution for -88=11+9r equation: 



-88=11+9r

We move all terms to the left:

-88-(11+9r)=0

We add all the numbers together, and all the variables

-(9r+11)-88=0

We get rid of parentheses

-9r-11-88=0

We add all the numbers together, and all the variables

-9r-99=0

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

-9r=99

r=99/-9

r=-11

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