def find_x_overlap(rect1, rect2):
	"""
	Return left_x and width of overlapping x of two rects
	"""
	r1left = rect1['left_x']
	r1right = r1left + rect1['width']
	r2left = rect2['left_x']
	r2right = r2left + rect2['width']

	highest_start_point = r1left if r1left >= r2left else r2left
	lowest_end_point = r1right if r1right <= r2right else r2right

	if highest_start_point < lowest_end_point:
		return highest_start_point, lowest_end_point - highest_start_point
	else:
		return None