Hi!
To find x, you'll need to divide by -6 on both sides of the equation. When -6x s divided, you're left w/ x. When 78 is divided by -6, you'll get -13.
So your answer is x<-13. You'll need to switch the sign because 13 is a negative so the greater than sign is turned into a less than sign. S your answer is D.
I hope this helps!