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If there were 5u of stamps, Fabian had 5u * 20% = 5u * 20/100 = 5u /5 =u stamps and Gerald had (5u -u ) = 4u stamps. 

If Gerald gave Fabian 24 stamps, Gerald now had ( 4u – 24) stamps and Fabian had (u + 24) stamps.

Given 

4u – 24 = u + 24

3u = 48

u = 16

Fabian had 16 stamps first. 

 

Check : 16 * 4 = 64

64 – 24 = 40 = 16 + 24  Checked.

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