8r-8=9r-1

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Solution for 8r-8=9r-1 equation: 



8r-8=9r-1

We move all terms to the left:

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

We get rid of parentheses

8r-9r+1-8=0

We add all the numbers together, and all the variables

-1r-7=0

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

-r=7

r=7/-1

r=-7

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