-13=r.5+8

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Solution for -13=r.5+8 equation: 



-13=r.5+8

We move all terms to the left:

-13-(r.5+8)=0

We get rid of parentheses

-r.5-8-13=0

We add all the numbers together, and all the variables

-r.5-21=0

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

-r.5=21

r=21/1

r=21

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