-19=1+2r

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Solution for -19=1+2r equation: 



-19=1+2r

We move all terms to the left:

-19-(1+2r)=0

We add all the numbers together, and all the variables

-(2r+1)-19=0

We get rid of parentheses

-2r-1-19=0

We add all the numbers together, and all the variables

-2r-20=0

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

-2r=20

r=20/-2

r=-10

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