White shapes and black shapes are used in a game. Some of the shapes are circles. All the other shapes are squares. The ratio of the number of white shapes to the number of black shapes is 7:3 The ratio of the number of white circles to the number of white squares is 2:7 The ratio of the number of black circles to the number of black squares is 1:2 Work out what fraction of all the shapes are circles. Give your answer as a fraction in its simplest form.
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