9=r-27

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Solution for 9=r-27 equation: 



9=r-27

We move all terms to the left:

9-(r-27)=0

We get rid of parentheses

-r+27+9=0

We add all the numbers together, and all the variables

-1r+36=0

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

-r=-36

r=-36/-1

r=+36

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