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If (4a + 7b) (4c - 7d) = (4a - 7b) (4c +...

If (4a + 7b) (4c - 7d) = (4a - 7b) (4c + 7d), then which one of the following is correct ?

A

`a/b=c/d`

B

`a/d=c/b`

C

`a/b=d/c`

D

`(4a)/(7b)=c/d`

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