i need the range if this function. please explain

Answer:
The range of the given function is (-∞,0]
Step-by-step explanation:
To solve this problem is convinient that you graph the function. First you can graph the function of |x|, then |x-5| (you move 5 units to the right), and finally -(1/3) |x-5| (the previous graph is inverted). When you see the graph you will understand that the range of this function is (-∞, 0].