Respuesta :

Answer:

Add 22/63

Step-by-step explanation:

3/7 + n = 7/9

Step 1:  Subtract 3/7 from both sides

3/7 + n - 3/7 = 7/9 - 3/7

n = 49/63 - 27/63

n = 22/63

Answer:  Add 22/63