13r-19r=12

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Solution for 13r-19r=12 equation: 



13r-19r=12

We move all terms to the left:

13r-19r-(12)=0

We add all the numbers together, and all the variables

-6r-12=0

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

-6r=12

r=12/-6

r=-2

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