2448 : [119 - (x - 6)] = 24
119 - (x - 6) = 2448 : 24
119 - (x - 6) = 102
x - 6 = 119 - 102
x - 6 = 17
x = 17 + 6
x = 23
----------------
280 - 9x - x = 80
280 - 10x = 80
10x = 280 - 80
10x = 200
x = 200 : 10
x = 20
tìm x
2448 : (119 - ( x - 6 ) = 24
119 - ( x-6) = 102
x- 6 =119 -102
x-6 =17
x =23
280 - 9 x - x =80
280 -10x=80
-10x = -200
x=20