-8=r-13

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Solution for -8=r-13 equation: 



-8=r-13

We move all terms to the left:

-8-(r-13)=0

We get rid of parentheses

-r+13-8=0

We add all the numbers together, and all the variables

-1r+5=0

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

-r=-5

r=-5/-1

r=+5

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