`(6\sqrt{8})/9-(5\sqrt{32})/25+(14\sqrt{18})/49`
`=(6.2\sqrt{2})/9-(5.4\sqrt{2})/25+(14.3\sqrt{2})/49`
`=(2.2\sqrt{2})/3-(4\sqrt2)/5+(2.3\sqrt2)/7`
`=(35.2.2\sqrt2)/105-(21.4\sqrt2)/105+(15.2.3\sqrt2)/105`
`=(140\sqrt2-84\sqrt2+90\sqrt2)/105`
`=(146\sqrt2)/105`