Answer: -1/8
Explanation:
Our task is to subtract these fractions:

The first thing we should notice is that their denominators are not the same. So to make them the same, we need to find the lcm of 8 and 4, which is 8.
Now, we don't need to do anything to the first fraction; as for the second one, we multiply its denominator by 2 to get to 8 :

We do the same thing to the numerator:

Now we just subtract the numerators:
