dont use excel functions

Question #3 (25 Points): The following two cash flows are said to be economically equivalent at 15 % interest. Determine the value of X for the second cash flow series. You are required to employ uniform and gradient series concepts (using formula or economic factors in your solution). $ 1000 $ 800 $ 900 $ 600 $ 600 $ 700 0 1. 2 3 4 5 X+$300 X+$200 X+$100 1 0.5 X 0 1 2 3 5