1. The problem asks which of the given equations have a solution of 7. 2. To determine if 7 is a solution, substitute $x=7$ into each equation and check if the equation holds true. 3. Since the equations are not provided, we cannot substitute or verify. 4. Please provide the equations labeled Ⓐ, Ⓑ, Ⓒ, and Ⓓ to proceed with the solution.