We complete the square for the first equation by adding $(-24/2)^2$ and $(-32/2)^2$ to both sides, which gives \[
(x^2-24x +144) +(y^2-32y +256)-16=0,
\] which is also equivalent to \[
(x-12)^2 +(y-16)^2 =4^2.
\] Similarly, the equation for the second circle is \[
(x+12)^2 +(y+16)^2 =4^2.
\] Hence, the centers of the circles are $(12,16)$ and $(-12,-16)$ respectively. Furthermore, the radii of the circles are equal to $4$.  Now the distance between the points $(12,16)$ and $(-12,-16)$ by the distance formula or similarity of $3-4-5$ triangles is $40$.  Therefore, to find the shortest distance between the two circles, we must subtract from $40$ the distances from the centers to the circles.  Thus, the shortest distance between the circles is $40-4-4 = \boxed{32}$.
What is the shortest distance between the circles defined by $x^2-24x +y^2-32y+384=0$ and $x^2+24x +y^2+32y+384=0$?
{'answer': '32', 'subject': 'Algebra', 'level': 5, 'unique_id': 'test/algebra/26.json'}