13=1-r+3r

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Solution for 13=1-r+3r equation: 



13=1-r+3r

We move all terms to the left:

13-(1-r+3r)=0

We add all the numbers together, and all the variables

-(2r+1)+13=0

We get rid of parentheses

-2r-1+13=0

We add all the numbers together, and all the variables

-2r+12=0

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

-2r=-12

r=-12/-2

r=+6

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