Hello...! :)
To solve we take into account that we must solve it with the law of signs in this case is:
So, we will add (13 + 5) which should give us 19 once we have done that we know that in the fraction two minus signs give a plus sign once that is done we divide 18 divided by 9 gives us two.
So the Result is 2
¿Doubts? On the comments. Greetings :D