$(24$ points$)$ Suppose that the final tableau obtained in using the simplex method to solve a linear programming problem with three variables $x_1,x_2,x_3$ and two slack variables $x_4$ and $x_5$ is:

$\backslash$table$[[c_B,,,,,,],[,x_1,x_2,x_3,x_4,x_5,x_B$