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L=prt solve for r

I don't know how to solve this indicated variable 

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Phillip R. | Top Notch Math and Science Tutoring from Brown Univ GradTop Notch Math and Science Tutoring from...
you want the letter r by itself. As written in this equation, r is being multiplied by letter p and letter t. To undo multiplication, we divide. So divide both sides of the equation by pt.
This will leave r by itself on one side and L / pt on the other side.
Therefore     r = L / pt