please give me a simple solution,find the effective power of the combination of two lenses in contact having powers (1) - Physics - Introduction to Physics

Question

please give me a simple solution,find the effective power of the
combination of two lenses in contact having powers (1) +5D and +3D,
(2)+5D and -3D (urgent)

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please give me a simple solution,find the effective power of the combination of two lenses in contact having powers (1) +5D and +3D, (2)+5D and -3D.(urgent)