If the system of equations $$2 x + 7 y + \lambda z = 3$$ $$3 x + 2 y + 5 z = 4$$ $$x + \mu y + 32 z = - 1$$ has infinitely many solutions, then $( \lambda - \mu )$ is equal to $\_\_\_\_$
If the system of equations
$$2 x + 7 y + \lambda z = 3$$
$$3 x + 2 y + 5 z = 4$$
$$x + \mu y + 32 z = - 1$$
has infinitely many solutions, then $( \lambda - \mu )$ is equal to $\_\_\_\_$