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The horizontal distance between two buildings is 70 \ m. The angle of depression of the top of the first building when seen from the top of the second building is 45^{\circ}. If the height of the second building is 120 \ m, find the height of the first building.
 
Answer:
 
The height of the first building is  .
 
(Note: Enter the number in the first box and the unit in the second box.)