1=8r-9r

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Solution for 1=8r-9r equation: 



1=8r-9r

We move all terms to the left:

1-(8r-9r)=0

We add all the numbers together, and all the variables

-(-1r)+1=0

We get rid of parentheses

1r+1=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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