Divide the length of the wall by 2 to find the center:
11/2 = 5.5 feet.
Divide the length of the shelf by 2 to find the center of the shelf:
2.5 / 2 = 1.25
Subtract the center of the shelf from the center of the wall:
5.5 - 1.25 = 4.25 feet.
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