i know they have found it already .....R4=16.8and R3=4.2...... but its too abstract for me , would you plz elaborate?
its from the textbook of this site http://www.allaboutcircuits.com/textbook/direct-current/chpt-10/thevenins-theorem/
its from the textbook of this site http://www.allaboutcircuits.com/textbook/direct-current/chpt-10/thevenins-theorem/