What is 6 + (-3)?

Adding 6 and -3 involves moving 6 units to the right from zero and then shifting back left by 3 units. This backward shift from 6 removes 3 positive units, resulting in a final position of 3. Visually on a number line, you move 6 spaces right, followed by 3 left, and end at 3. The operation demonstrates that adding a positive number and a smaller negative number leads to a positive sum, especially when the magnitude of the positive number is greater.