Answer:
-2/45
Explanation:
First, make term a into an improper fraction:

Now, plug in all terms to the equation:

Simplify the Numerator:

Note that the absolute value of a negative value is the same positive value:

Simplify the Denominator:

Now Simplify: (You can remove the absolute value at this point)

Simplify:

Therefore, your anwer is -2/45