3636 : 36 = 101
101 + 91 = 192
192 : 12 = 16 vậy x = 16 tick đúng nha Nguyễn Đan Khanh
3636 : ( 12 . x - 91 ) = 36
12 . x - 91 = 3636 : 36
12 . x - 91 = 101
12 . x = 101 + 91
12 . x = 192
x = 192 : 12
x = 16
(12.x-91)=3636:36
12.x-91=101
12.x=101+91
12.x=192
x=192:12
x=16