Answer:
B. Collect like terms
Explanation:
The first step is to subtract 
 from each side of the equation, and we have the following
 from each side of the equation, and we have the following

We can see that on the left side of the equation we have like terms (the two terms containing x)
so the next step is to combine or collect those like terms 
 and
 and 
 to simplify the expression:
 to simplify the expression:

We are not distributing or eliminating the 
 (because there is still a term with x on the right side), nor are we completely isolating the
 (because there is still a term with x on the right side), nor are we completely isolating the 
 yet.
 yet.
What was done in this step was to collect like terms.