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An object sits between two f = 10 cm convex lenses on a 1D axis. The...

An object sits between two f = 10 cm convex lenses on a 1D axis. The oject is 20 cm from the right lens. How far (in cm) must the object be from the left lens so that they images made by the lenses are located at the same point on the 1D axis?  

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