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