Mình làm luôn nhé !!!
= ( x + 16 ) x 12 = 240 - 180
= ( x + 16 ) x 12 = 60
= ( x + 16 ) = 60 : 12
= ( x + 16 ) = 5
= x = 5 - 16
= x = - 11
240 - (x + 16) : x . 12 = 180
(x + 16) : x . 12 = 240 - 180
(x + 16) : x . 12 = 60
(x + 16) : x = 60 : 12
(x + 16) : x = 5
x + 16 = 5
x = 5 - 16
x = -11