-13=r/1+8

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Solution for -13=r/1+8 equation: 



-13=r/1+8

We move all terms to the left:

-13-(r/1+8)=0

We get rid of parentheses

-r/1-8-13=0

We multiply all the terms by the denominator


-r-8*1-13*1=0

We add all the numbers together, and all the variables

-1r-21=0

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

-r=21

r=21/-1

r=-21

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