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For a = 8, b = 5 and c = 7, which of the...

For a = 8, b = 5 and c = 7, which of the following is not true?

A

`a+b=b+a`

B

`(a+b)+c=a+(b+c)`

C

`(axxb)xxc=axx(bxxc)`

D

`a-b=b-a`

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