OK , I have a dart board that is in a cabinet. The holes for the hooks on the back of the cabinet are 21 ¼” part. The holes are 5” higher then the bulls eye. Now I need to mount the cabinet to a piece of plywood that is 30”x45” then to a wall that is 83” tall. Once hung the bulls eye must be 5’ 8” from the ground. Now I am completely at a loss as to how to even begin to do this ! Please if you have any mathematical skills and want to either help a guy out or just show off or what ever please Help!

Let's presume that the center of the dart board is going to end up in the center of the piece of plywood. Place your mounting screws 17.5" down from the top of the plywood. Mount the plywood on the wall with the bottom edge 45.5" from the floor.

EDITED BOTTOM DIMENSION