Spreading a single variable/column in a dataset with many columns, aggregating the other variables

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I have a dataset as follows:

DT <- structure(list(Geo_level = c(50L, 50L, 50L, 50L, 50L, 50L, 50L, 
50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L,


                      
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