-8r-1=-10r+9

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Solution for -8r-1=-10r+9 equation: 



-8r-1=-10r+9

We move all terms to the left:

-8r-1-(-10r+9)=0

We get rid of parentheses

-8r+10r-9-1=0

We add all the numbers together, and all the variables

2r-10=0

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

2r=10

r=10/2

r=5

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