Simple math equation can be solved using 5th-grade trick, yet many are still stumped — can you figure it out?

Over the weekend, user @BholanathDutta shared the equation that looked relatively simple to his thousands of followers, until ...
IEEE

A Simple and Efficient Joint Source Location and Signal Propagation Speed Estimator Using AOA and TDOA Measurements

Abstract: Hybrid localization that both angle-of-arrival (AOA) and time-difference-of-arrival (TDOA) measurements are available but the signal propagation speed (SPS) is unknown arise in, e.g., ...