When we're subtracting a larger number from a smaller number, such as 7-10, we need to find the difference between the two numbers. In this case, we subtract the smaller number, which is seven, from the larger number, which is ten. The result is three. However, since we are starting to the right of zero on the number line, we need to make our answer negative. This means we are going to the left of zero, into the negative zone, by subtracting ten places. Therefore, our final answer is negative three.