181=1-9r

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Solution for 181=1-9r equation: 



181=1-9r

We move all terms to the left:

181-(1-9r)=0

We add all the numbers together, and all the variables

-(-9r+1)+181=0

We get rid of parentheses

9r-1+181=0

We add all the numbers together, and all the variables

9r+180=0

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

9r=-180

r=-180/9

r=-20

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