suy ra : x-35-120=0
suy ra: x-35=120
suy ra: x=155 (T/M)
Vậy x=155
( x -35 ) - 120 = 0
x - 35 = 0 + 120
x - 35 = 120
x = 120 + 35
x = 155
(x - 35) - 120 = 0
x - 35 = 120 + 0 ( TSBT)
x - 35 = 120
x = 120 + 35 ( TSBT )
x = 155
( x - 35 ) - 120 = 0
( x - 35 ) = 0 + 120
x - 35 = 120
x = 120 + 35
x = 155
(x-35)-120=0
x-35=120+0
x-35=120
x=120+35
x=155