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

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