for the width, see how much too wide the wall is: 8' - 21" = 6'3"
So, you need half of that on each side: 3'1.5"
Place the left side of the picture 3'1.5" from the left wall. That will put the right side 3'1.5" from the right wall.
Follow the same procedure with the height.
How do do you center a poster that is 21”x 42” high to an 8’x11’ wall
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