Answer:

Explanation:
 - 
 Subtracting a negative number is the same as adding a positive
 + 
 Rewrite each fraction with a common denominator. Let's use 12 as our new denominator.
 = 
 multiple the top and the bottom of the first fraction by 3 to get the equivalent fraction 

 = 
 Multiple the top and bottom of the first fraction by 4 to get the equivalent fraction 
.
Now, add the two fractions
 + 
 = 
 The denominator stays the same and you add the numerators.