Solve a Rubik's Cube
Cubically, 3 bytes

rp▦


Try it online! You can use this to print a random cube.

Explanation:

r    read cube from stdin
 p   set PRINTMOVES flag to display moves as they are performed on the cube
  ▦  insert moves to solve the cube at the current point in the program


Capitalize the P to see prettier output (e.g. RLD'U2 as opposed to R1L1D3U2).