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Hi,In the attachment I drew the full mechanism of the first addition + elemination.I didn't draw the hydrolisis of the nitrile group, but you can look that up in your book (well known reaction). Hope it helps.
So in summary of that lot:The first product is still a nitrile.The acid hydrolyses it to the carboxylic acid and causes the elimination of water to give the product you drew.
I don't think that C9H7N is correct.