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Identify the appropriate property demonstrated in the following statments:

1. Changing the of factors $(x+7)(y-12) = (y-12)(x - 6)$ does not change the product.

2. $(x+y)+12=x+(y+12)$ can be from left to right or right to left.

3. The sum of zero and any number is regardless of the number.

4. The product of one and any number is regardless of the number.

5. $(7 x)y=7 (xy)$ can be from left to right or right to left.

6. Changing the of addends $7+12 = 12+7$ does not change the sum.

You can earn partial credit on this problem.