-2r+1-9r=9-10r

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Solution for -2r+1-9r=9-10r equation: 



-2r+1-9r=9-10r

We move all terms to the left:

-2r+1-9r-(9-10r)=0

We add all the numbers together, and all the variables

-2r-9r-(-10r+9)+1=0

We add all the numbers together, and all the variables

-11r-(-10r+9)+1=0

We get rid of parentheses

-11r+10r-9+1=0

We add all the numbers together, and all the variables

-1r-8=0

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

-r=8

r=8/-1

r=-8

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