-27=r-(4+9)

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Solution for -27=r-(4+9) equation: 



-27=r-(4+9)

We move all terms to the left:

-27-(r-(4+9))=0

We add all the numbers together, and all the variables

-(r-13)-27=0

We get rid of parentheses

-r+13-27=0

We add all the numbers together, and all the variables

-1r-14=0

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

-r=14

r=14/-1

r=-14

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