Solution - Simplification or other simple results

Step  1  :

Step  2  :

Pulling out like terms :

 2.1    Simplify ( 3x-3y )³

Put the exponent aside and simplfy the base by pulling out like factors :
 3x-3y  =  3 • (x-y) 

Remember the 4th law of exponents : (a • b)^m= a^m• b^m

Retract the exponent and apply the 4th law to the simplified base: ( 3 • (x-y) )³ =  (3)³ • (x-y)³  

Final result :

  (3)3 • (x - y)3