Answer:
C
Explanation:
So we have the equation:

And we want to find the value of x such that k is -4.
To do so, we can substitute -4 for k and then solve for x.
So, substitute -4 for k:

And now, we just have to solve for x.
Let's multiply both sides by 5:

The left side cancels. Multiply on the right:

Now, let's add 2 to both sides:

The left side cancels again. Add on the right:

Therefore, the value of x is -18.
Our answer is C.
And we're done!