r+4=13-13r

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Solution for r+4=13-13r equation: 



r+4=13-13r

We move all terms to the left:

r+4-(13-13r)=0

We add all the numbers together, and all the variables

r-(-13r+13)+4=0

We get rid of parentheses

r+13r-13+4=0

We add all the numbers together, and all the variables

14r-9=0

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

14r=9

r=9/14

r=9/14

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