Make sure every number and every letter inside the parentheses 
top and bottom has an exponent showing.  If it doesn't, give 
it a 1 exponent:



Next we remove the parentheses by multiplying every exponent inside
the parentheses by the 3 exponent just outside the parentheses on 
the right:





3³ = 3·3·3 = 27
5³ = 5·5·5 = 125

Replace those:



Finally subtract the exponent of
x3 from the exponent of x6
getting x3, and place it in the
numerator because the larger exponent x6
was in the numerator, removing the x³ from
the denominator.

 

Edwin