Both fractions have the same denominator, so you can combine the terms in the numerator so that it looks like

After you combine like terms, you are left with  in the numerator. The next step is to see what will cancel out. . The  in the denominator can be canceled out, and you are left with  in the numerator. 

If you are having trouble visualizing this it would look like . You can cross out the two x's on the bottom, and two of the x's on the top. Therefore the answer is 

To simplify this you need to find a common denominator of all the fractions which is "24"

You must multiply the numerator and the denominator by the value that gave you "24" on the bottom.

So you will get:

  which equals  

The rules for adding fractions containing unknowns  are the same as for fractions containing explicit numbers, so you can guide yourself by recalling how you would proceed adding fractions such as,  

As you know you need to write them with a common denominator. In this case the least common denominator is . So simply multiply the numerator and denominator of each fraction by the denominator of the other fraciton.

Notice that  and  are equal to one, this ensures that we are not changing the value of the fractions, we are changing only the representation of the value. 

Similairily, the procedure for an algebraic expression containing unknowns parallels this idea, 

Now we can add the numerators directly since we now have both terms expressed with a common denominator, .

When adding fractions, the first thing we need to do is get a common denominator. 

Then when adding, only add the numbers on the top, while leaving the common number on the bottom the same. Once we get a final answer, simplify accordingly. 

When adding fractions, the first thing we need to do is get a common denominator. 

Then when adding, only add the numbers on the top, while leaving the common number on the bottom the same. Once we get a final answer, simplify accordingly. 

When adding fractions, the first thing we need to do is get a common denominator. 

Then when adding, only add the numbers on the top, while leaving the common number on the bottom the same. Once we get a final answer, simplify accordingly. 

When adding fractions, the first thing we need to do is get a common denominator. 

Then when adding, only add the numbers on the top, while leaving the common number on the bottom the same. Once we get a final answer, simplify accordingly. 

When adding fractions, the first thing we need to do is get a common denominator. 

Then when adding, only add the numbers on the top, while leaving the common number on the bottom the same. Once we get a final answer, simplify accordingly. 

When adding fractions, the first thing we need to do is get a common denominator. 

Then when adding, only add the numbers on the top, while leaving the common number on the bottom the same. Once we get a final answer, simplify accordingly. 

When adding fractions, the first thing we need to do is get a common denominator. 

Then when adding, only add the numbers on the top, while leaving the common number on the bottom the same. Once we get a final answer, simplify accordingly.