This is an Practice example from the Hayt/Kemmerley/Durbin Engineering Circuit Analysis. They ask to find the Thevenin equivalent and give answers of -502.5 mV and -100.5 Ohms.
I am trying to figure out the steps (thought process) to solve this problem with no success. Can someone walk through the steps they took to get this answer? BTW, this is self-study, not homework.