An object is placed 476 cm to the left of a negative lens of focal length -138 cm. A positive lens, of focal length +43.6 cm is placed with some separation, s, to the right of the negative lens. Calculate the appropriate separation between the two lenses, s, so that an inverted image of the original object will appear on a screen placed 50.0 cm to the right of the positive lens. Assume both lenses are thin spherical lenses).