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9867555555555555555555754983748888888888888888888884444444444444448988000000000000000000000000000000000000000000000000480.....27777777777777777777779999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
Ta có: 4n+7= 2.( 2n+1)+5
Do đó: 4n+7 chia hết cho 2n+1 <=> 5 chia hết cho 2n+1 <=> 2n+1 thuộc Ư(5) thuộc +_1;+_5
Do đó: 2n+1=1 => 2n= 0 => n= 0
2n+1=-1 => 2n= 2 => n= -1
2n+1=5 => 2n= 4 => n= 2
2n+1=-5 => 2n= -6 => n= -3
Vậy n thuộc 0;-1;2;-3
Giải xong rồi hihi 
thuộc 0 và 2 thì phải ns rõ ra là thuộc số tự nhiên chớ chứ k ns rõ đề mà
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 MŨ 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999