  We investigate the behavior of trajectories of a $(3,2)$-rational $p$-adic
dynamical system in the complex $p$-adic filed ${\mathbb C}_p$, when there
exists a unique fixed point $x_0$. We study this $p$-adic dynamical system by
dynamics of real radiuses of balls (with the center at the fixed point $x_0$).
We show that there exists a radius $r$ depending on parameters of the rational
function such that: when $x_0$ is an attracting point then the trajectory of an
inner point from the ball $U_r(x_0)$ goes to $x_0$ and each sphere with a
radius $>r$ (with the center at $x_0$) is invariant; When $x_0$ is a repeller
point then the trajectory of an inner point from a ball $U_r(x_0)$ goes forward
to the sphere $S_r(x_0)$. Once the trajectory reaches the sphere, in the next
step it either goes back to the interior of $U_r(x_0)$ or stays in $S_r(x_0)$
for some time and then goes back to the interior of the ball. As soon as the
trajectory goes outside of $U_r(x_0)$ it will stay (for all the rest of time)
in the sphere (outside of $U_r(x_0)$) that it reached first.
