Пошаговое объяснение:
13/21 - (х - 2 5/7) = 3/14
13/21 - х + 2 5/7 = 3/14
26/42 - х + 2 30/42 = 9/42
2 56/42 - х = 9/42
3 14/42 - х = 9/42
х = 3 14/42 - 9/42
х = 3 5/42
Ответ: Г) 3 5/42
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Пошаговое объяснение:
13/21 - (х - 2 5/7) = 3/14
13/21 - х + 2 5/7 = 3/14
26/42 - х + 2 30/42 = 9/42
2 56/42 - х = 9/42
3 14/42 - х = 9/42
х = 3 14/42 - 9/42
х = 3 5/42
Ответ: Г) 3 5/42