$21\mathrm{.}23$ What is the value of $x$ if the given cash flow diagrams are equivalent? Assume $i=8\%.$

$21\mathrm{.}24$ Your future company has been presented with an opportunity to invest in a project with the following cash flow for ten years. If the company would like to make at least $8\%$ on its investment, would you invest in the project?

$\backslash$table$[[$Initial investment,$$10,000,000$