An Algebraic Challenge -- Part 3
Before looking at the question, please read the instruction carefully.
INSTRUCTION: The below given question is just for self analysis of how much time you take to solve it. If you can solve the question WITHIN 18 SECONDS after reading the QUESTION, then, you are exceptional (according to me).
QUESTION: If a² + 2b = 7, b² + 4c = -7 and c² + 6a = -14, what is the value of (-abc)?