Respuesta :

Answer:

21u+3

Step-by-step explanation:

sorry if this isnt the answer youre looking for

Answer: 21u+3

Step-by-step explanation:

(7u+1)(3)

Move the 3 to the front

(3)(7u+1)

Distribute the 3 into the 7u and 1 (multiply)

21u+3