-8=r-9

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Solution for -8=r-9 equation: 



-8=r-9

We move all terms to the left:

-8-(r-9)=0

We get rid of parentheses

-r+9-8=0

We add all the numbers together, and all the variables

-1r+1=0

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

-r=-1

r=-1/-1

r=1

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