Given:

Let's solve the equation by factoring,
Subtract 4 from both sides:

Now, let's factor by grouping.
Rewrite -15x as (x - 16x):

Now we have two groups:

Factor out x from the first group and factor out -4 from the second group:

Thus, we have the factors:

Set each factor to zero and solve for x:

Therefore, the solutions are:

ANSWER: D
