Answer is 2*1*6
Logic is:
Remove stars from L.H.S, so that which equals the Cube of the R.H.S.
5*1*2=8
=>> 512 = 8 (Removing star)
=>> 512 = 8*8*8 (Correcting the equation)
3*4*3=7
=>> 343 = 7
=>> 343 = 7*7*7
1*2*5=5
=>> 125 = 5
=>> 125 = 5*5*5
6 = 6*6*6 = 216
So 6 = 2*1*6