A small positively charged particle is placed at rest in a region of space where two point charges are fixed in position. The first point charge has a charge of $$+2q$$ and is located at position $$(0, 0)$$, while the second point charge has a charge of $$-q$$ and is located at position $$(d, 0)$$. At which position along the x-axis would the small particle experience zero net electric field?