Well for starters, to negatives next to eachother make a positive. So now we rewrite the problem, -11/12 + 5/12.
Since 11/12 is bigger than 5/12, we use the bigger number’s sign which is subtraction. So 11/12 - 5/12 = 6/12.
However, you want the answer to be in simplest form. You can break down 6/12 to a smaller fraction by dividing 6 into both numbers. 6 divides by 6 is 1. And 12 divided by 6 is 2.
So your final answer is 1/2. Also known as half. I hope this helped.