1-(49/67-X/67)=18/67 49/67 - х/67 = 1 - 18/67 49/67 - х/67 = 67/67 - 18/67 49/67 - х/67 = 49/67 х/67 = 49/67 - 49/67 х/67 = 0 х= 0 * 67 х = 0