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Hi,
If I am understanding the Question properly:
solving
3^2 * 3^x = 3^8 
      3^x = 3^8/3^2
      3^x = 3^6
        x = 6
15^12/5^12 = x^12 
     (3*5)^12/5^12 = x^12
     3^12*5^12/5^12 = x^12
            3^12 = x^12
               3 = x
5^4 * 6^4 = x^4
  (5*6)^4  = x^4
       30 = x