1=9-r

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Solution for 1=9-r equation: 



1=9-r

We move all terms to the left:

1-(9-r)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1r-9+1=0

We add all the numbers together, and all the variables

r-8=0

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

r=8

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