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Fill in the blanks to make a statement true and determine what property.
1. 7x __= 7
2. 3 (2 + 7) = __+ 21
3. 2 x 6 =__ x 2
4. 4 + __ = 8 + 4
5. (__ x 4) + (5 x 10) = 5 x (__ x 10)
ps: pls answer, need much