13r-12r-1=12

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Solution for 13r-12r-1=12 equation: 



13r-12r-1=12

We move all terms to the left:

13r-12r-1-(12)=0

We add all the numbers together, and all the variables

r-13=0

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

r=13

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