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If (7a + 8b)/( 7c + 8d) = (7a - 8b)/(7c ...

If `(7a + 8b)/( 7c + 8d) = (7a - 8b)/(7c - 8d),` prove that :
(i)`a:b=c:d`
(ii) `(4a - 5b)/(4c - 5d)= (3a + 4b)/(3c + 4d)`

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