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If (3k+4l+6m+7n)/(3k+4l-6m-7n) = (3k-4l+...

If `(3k+4l+6m+7n)/(3k+4l-6m-7n) = (3k-4l+6m-7n)/(3k-4l-6m+7n)`,then show that k, 2m, 4l and 7n are in proportion.

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