Ответ:

Пошаговое объяснение:

3. 9/14х - 2. 17/21 = 1. 1/9

3. 9/14х = 1. 1/9 + 2. 17/21

3. 9/14х = 1. 7/63 + 2. 51/63

3. 9/14x = 3. 58/63

51/14x = 247/63

х = 247/63 : 51/14

х = 247/63 * 14/51

х = 247/9 * 2/51

х = 494/459

х = 1. 35/459