Problem with back button flash 8 (as2)

Hello, I need your help.
I have to solve a system with 3 undifined values in math.I read my values from text box and after to show the solution a use go to frame(5) where represent the solution and some messages. After if the user want to go back to main page(frame(1)) I have a button back on the screen on frame(5). My problem is that when a go back all the values are reset. I don´t want this to happen but i want everytime a user go back to see the values that has filled before. Can someone help me please? I upload my assigment here.