-1=2r+1

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Solution for -1=2r+1 equation: 



-1=2r+1

We move all terms to the left:

-1-(2r+1)=0

We get rid of parentheses

-2r-1-1=0

We add all the numbers together, and all the variables

-2r-2=0

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

-2r=2

r=2/-2

r=-1

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