Respuesta :

Answer:

3x + 21

Step-by-step explanation:

3(x+7)

3 * x + 3 * 7

3x + 21

HOPE THIS HELPS

PLZZ MARK BRAINLIEST

Answer:

3x + 21

Step-by-step explanation:

3(x + 7)

3(x + 21)

3x + 21