Answer:
It would be 9 units.
Explanation:
So to find the distance between two points, first start at one of the points then see how much distance there is between it and 0.
So taking 7 to start with, you would need to walk 7 units to get to 0.
However, we still need to get the distance till -2. So, we need to walk another 2 steps back, so it would be 9 units of walking in total.