A single fraction whose numerator is a sum or difference is
equal to the sum or difference of the fractions consisting
of the terms of the numerator each over the denominator

Your expression:

 is a single fraction whose numerator is a difference
of 3x and 2.  Therefore it can be witten as the difference of two 
fractions  x and 

So we have:

 = x- and  reduces to .


Answer:  x-

You should write:

 = x- = x-

Edwin