I have a complex equation that is equal to zero with just one unknown that I
have entered as "x". I need to know how to use solver to solve for the
unknown variable. How do I do this? It seems like it should be simple, but
I'm not sure how to enter the unknown into the equation. I keep getting the
error, "Invalid target cell." Which makes me think that I should enter the
unknown into a different cell, or something else. Please help!!!