-9=r+1

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Solution for -9=r+1 equation: 



-9=r+1

We move all terms to the left:

-9-(r+1)=0

We get rid of parentheses

-r-1-9=0

We add all the numbers together, and all the variables

-1r-10=0

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

-r=10

r=10/-1

r=-10

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