You would have to add a positive 6 to the negative 6 to get zero. Lets say you have -2 in order to get it to zero or just any positive number, you have to add a positive of the same value or higher to be able to get it there. I hope you understand that.
The least common denominator is 36
You found $5, so it's positive. You don't put anything in the negative, because you aren't losing anything.
Answer: 3 (
x
+
7
)
Step-by-step explanation: