Operate the Math - A Difficult Puzzle : 9 _ 8 _ 7 _ 4 = -5

This puzzle is a perfect method to judge your numerical adeptness and to refine your intellectual acuity. An equation with three unidentified operations will be presented, and you must discover the hidden operators and complete the equation. It is a wonderful way to practice your math skills and to exercise your reasoning agility. Brace yourself to flex your mind and to have a great time!