Answer:
All real numbers.
Step-by-step explanation:
So we have the equation:
Remove the absolute value bars. Definition of absolute value:
Note that we change the sign on the right because we multiplied by a negative.
Divide both sides by 3:
Now, look at this inequality. This says that the solution is all the numbers to the right of -4 and all numbers to the left of 4.
I've provided a number line. The red line represents x>-4 and the blue line represents x<4.
As you can see, every value is covered both towards the left and the right.
In other words, our answer is all real numbers.