25r-9r+10r-13r=39

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Solution for 25r-9r+10r-13r=39 equation: 



25r-9r+10r-13r=39

We move all terms to the left:

25r-9r+10r-13r-(39)=0

We add all the numbers together, and all the variables

13r-39=0

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

13r=39

r=39/13

r=3

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