-10-r+1=9+r

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



-10-r+1=9+r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-1r-r-9-9=0

We add all the numbers together, and all the variables

-2r-18=0

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

-2r=18

r=18/-2

r=-9

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