-9=r-2

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Solution for -9=r-2 equation: 



-9=r-2

We move all terms to the left:

-9-(r-2)=0

We get rid of parentheses

-r+2-9=0

We add all the numbers together, and all the variables

-1r-7=0

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

-r=7

r=7/-1

r=-7

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