13+13r=-12+11r-9

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Solution for 13+13r=-12+11r-9 equation: 



13+13r=-12+11r-9

We move all terms to the left:

13+13r-(-12+11r-9)=0

We add all the numbers together, and all the variables

13r-(11r-21)+13=0

We get rid of parentheses

13r-11r+21+13=0

We add all the numbers together, and all the variables

2r+34=0

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

2r=-34

r=-34/2

r=-17

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