Answer:
Additive inverse of (5-6) is (6-5),
------------------------------
So:
(5-6)+(6-5)=0
5-6+6-5=0
5-6=-6+5
-------------------------
Left <--- -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6 ---> Right
Move 5 places to the right of -6 and you should land on -1.
