13=1+4r

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Solution for 13=1+4r equation: 



13=1+4r

We move all terms to the left:

13-(1+4r)=0

We add all the numbers together, and all the variables

-(4r+1)+13=0

We get rid of parentheses

-4r-1+13=0

We add all the numbers together, and all the variables

-4r+12=0

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

-4r=-12

r=-12/-4

r=+3

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