x + 100 - x - x - x - x -x + 2004 : 2 = 1000 hộ mik cậu này.

` x + 100 - x - x - x - x - x + 2004 : 2 = 1000`

` x + 100 - 5x + 1002 = 1000`

` x(1-5) + 100 = 1000 - 1002`

` x(-4) + 100 = -2`

` x(-4) = -2-100`

` x(-4) = -102`

` x = (-102):(-4)`

` x = 102 : 4`

` x = 25,5`

Vậy `x = 25,5`