13=5+r

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Solution for 13=5+r equation: 



13=5+r

We move all terms to the left:

13-(5+r)=0

We add all the numbers together, and all the variables

-(r+5)+13=0

We get rid of parentheses

-r-5+13=0

We add all the numbers together, and all the variables

-1r+8=0

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

-r=-8

r=-8/-1

r=+8

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