Respuesta :

Answer: 9b+4n+6d+7

Step-by-step explanation:

1. 9b+9+4n−4+6d+2

2. 9b+4n+6d+(9-4+2)

3. 9b+4n+6d+7
Answer
4n+6d+9b+7

Explanation
Subtract 4 from 9 to get 5
Add 5 and 2 to get 7

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