Each of the following is an example of one of the properties of whole-number addition. Fill in the blank to make a true statement and identify the property.
a. 3 + 4 = __+ 3
b. 5 + (4 + 3) = (4 + 3) + __
c. 8 + __ = 8
d. 3 + 14 + 52 = (3 + __) + 5
e. 3 + 4 is a unique__number.
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