Ruan Fanghua and Liu Cheng, originally supposed to be parallel lines in geometry, Fang and Cheng finally formed an equation. Is this equation simple and easy to solve, or is it difficult to solve? What is the solution? Is it to break the bond, or to free each other? Let's solve the equation together! ~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~, counterpart, worth counterpart counterpart counterpart counterpart worth, counterpart, counterpart, counterpartfully, length, length, length,,,, respectively, length, length, lengths of of a sunny man's long-planned revenge story.