Xiao Li drew a number axis when he was working on the question. There was a point a on the number axis, which represented the number - 3. Due to carelessness, he marked the origin of the number axis wrong, so that the point a just fell on the position of the opposite number of - 3. If you want to draw the number axis correctly, which direction should the origin move to? How many units of length?

Xiao Li drew a number axis when he was working on the question. There was a point a on the number axis, which represented the number - 3. Due to carelessness, he marked the origin of the number axis wrong, so that the point a just fell on the position of the opposite number of - 3. If you want to draw the number axis correctly, which direction should the origin move to? How many units of length?

As shown in the figure, the origin should move 6 units to the right