1=13-2r

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Solution for 1=13-2r equation: 



1=13-2r

We move all terms to the left:

1-(13-2r)=0

We add all the numbers together, and all the variables

-(-2r+13)+1=0

We get rid of parentheses

2r-13+1=0

We add all the numbers together, and all the variables

2r-12=0

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

2r=12

r=12/2

r=6

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