À nhon, mình Nghi 2k6 lớp 8 nhé

25 x (X - 590 x 5 + 2) = 75

       (X - 590 x 5 + 2) = 75 : 25

       (X - 590 x 5 + 2) = 3

           (X - 2950 + 2) = 3

           X - (2950 - 2)  = 3

                    X - 2948 = 3

                               X = 3 + 2948

                               X = 2951

316 + 23 - x = 62

=> 339 - x = 62

=> x = 339 - 62

=> x = 277