Answer: For this case we have the following expression:
 
 We must factor the term that accompanies the variable.
 We have then:
 Rewriting the expression we have:
 We're going to check the result. To do this, we multiply the term 3/8 for each term within the parenthesis:
Rewriting:
 The factorization is correct.
 Answer:
 (3/8) (d + 2)
Hope this helps... Stay safe and have a great rest of the day... :D