[arso96]

Hello everyone,
I am asking for your help because at the moment I am demonstrating cubic equations of state, here I block on that of peng robinson, I have the general form and I will want to transform it into a cubic equation according to Z (see picture attached), knowing that I have A and B, I tried to do the opposite way but to no avail, if someone could help me I would be really grateful
thank you
Image :