-1=3+2r

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Solution for -1=3+2r equation: 



-1=3+2r

We move all terms to the left:

-1-(3+2r)=0

We add all the numbers together, and all the variables

-(2r+3)-1=0

We get rid of parentheses

-2r-3-1=0

We add all the numbers together, and all the variables

-2r-4=0

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

-2r=4

r=4/-2

r=-2

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