Verified answer

(5/6 + 3/7) - х = 13/14

х = (5/6 + 3/7) - 13/14

х = 53/42 - 39/42

х = 14/42

х = 1/3 - сократили на 14

х · 3 = 1/3 · 3 = 3/3 = 1

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Пояснения:

5/6 + 3/7 = 35/42 + 18/42 = 53/42 - уменьшаемое

53/42 - 13/14 = 53/42 - 39/42 = 14/42 = 1/3 - вычитаемое

1/3 · 3 = 3/3 = 1 - утроенное вычитаемое

Ответ: 1.