8=9-r

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Solution for 8=9-r equation: 



8=9-r

We move all terms to the left:

8-(9-r)=0

We add all the numbers together, and all the variables

-(-1r+9)+8=0

We get rid of parentheses

1r-9+8=0

We add all the numbers together, and all the variables

r-1=0

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

r=1

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