Finite parametrization of solutions of equations in a free monoid. II

In the preceding paper of the author parametrizing functions Fi, Th, Ro were introduced depending on word variables, positive-integer variables, and variables whose values are finite sequences of positive-integer variables. With the help of the parametrizing functions Fi, Th, Ro finite formulae are written out for the family of solutions of every equation of the form $\varphi(x_1,x_2,x_3) x_4=\psi(x_1,x_2,x_3) x_5$, where $\varphi(x_1,x_2,x_3)$ and $\psi(x_1,x_2,x_3)$ are arbitrary words in the alphabet $x_1$, $x_2$, $x_3$ in a free monoid.