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10-03-2021
Mathematics

contestada

(3d + 9) + (4a+6)=
Ssdddd

Respuesta :

10-03-2021

Answer:

4a + 3d + 15

Step-by-step explanation:

Remove parentheses.

3d + 9 + 4a + 6

Add 9 and 6.

3d + 4a + 15

Reorder 3d and 4a.

4a + 3d + 15

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