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To reflect a point over the y-axis, we negate the x-coordinate while keeping the y-coordinate the same.
If the original point is D(x, y), the reflected point D'(-x, y) will have the same y-coordinate but the negated x-coordinate.
So, if the coordinates of point D are (x, y), the coordinates of point D' after reflecting over the y-axis will be (-x, y).