So the two possible original temperatures would be either -9 or 9.
Answer:

Step-by-step explanation:

Step 1: Divide the numbers

Step 2: Simplify

Step 3: Simplify

Therefore, the simplified answer is 
Answer:
9/12
Step-by-step explanation:
Both 9 and 12 can be divided by 3, so it is not in simplest form.