1/ -16 + 23 + x = -16
x = -16 + 16 - 23
x = -23
Vậy x = -23
2/ 2x – 35 = 15
2x = 50
x = 25
Vậy x = 25
3/ -13.│x│ = -26
| x | = 2
* x = 2
* x = -2
Vậy x = 2 hoặc x = -2
4/ ( 27 – x ) + ( 15 + x ) = x – 24
27 – x + 15 + x - x = -24
-x = -24 - 27 - 15
-x = -66
x = 66
Vậy x = 66