Delete duplicate values in column

I have privot table that have position_id and provider_id. How delete duplicate values that table can look like second table. I would like solve this task by eloquent. First table display next code:

MyTable::with('provider')->with('position')->orderBy('position_id')->get()

position_id provider_id
7            1
7            2
7            3  
9            5
9            6  
10           7


position_id provider_id
7       1
        2
        3   
9       5
        6   
10      7

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