r+4,r=13

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Solution for r+4,r=13 equation: 



r+4.r=13

We move all terms to the left:

r+4.r-(13)=0

We add all the numbers together, and all the variables

5r-13=0

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

5r=13

r=13/5

r=2+3/5

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