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If (a+bk)/(a-bk) = (b+ck)/(b-ck) = (c-dk...

If `(a+bk)/(a-bk) = (b+ck)/(b-ck) = (c-dk)/(c-dk)` where `k != 0 , a, b , c d gt 0 ` and none of them equals 1 , then

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