13=r-3

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Solution for 13=r-3 equation: 



13=r-3

We move all terms to the left:

13-(r-3)=0

We get rid of parentheses

-r+3+13=0

We add all the numbers together, and all the variables

-1r+16=0

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

-r=-16

r=-16/-1

r=+16

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