13=r+9+1

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Solution for 13=r+9+1 equation: 



13=r+9+1

We move all terms to the left:

13-(r+9+1)=0

We add all the numbers together, and all the variables

-(r+10)+13=0

We get rid of parentheses

-r-10+13=0

We add all the numbers together, and all the variables

-1r+3=0

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

-r=-3

r=-3/-1

r=+3

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