13=4+r-12

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Solution for 13=4+r-12 equation: 



13=4+r-12

We move all terms to the left:

13-(4+r-12)=0

We add all the numbers together, and all the variables

-(r-8)+13=0

We get rid of parentheses

-r+8+13=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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