It's on the second page on the online pdf : http://faculty.ksu.edu.sa/ghulam/Documents/CEN455_materials/ModelTimeDomain.pdf
Its the beginning of step 3 taking the laplace transform. I dont know how i can gett to the formule:
I(s)=1/R(1/s-1/(s+R/L)....
I thank you very much in advance.
greetings...