The document describes finding the x-coordinate for a point A(2m,4) to be on the line x+5y-2=0. It states that a point is on a line if its coordinates satisfy the line's equation. Plugging the coordinates of point A(2m,4) into the line's equation x+5y-2=0 and solving for m yields that m must equal -9 for point A to lie on the given line.