4 - ( 27 - 3) = x - ( 13 - 4 )
4 - 24 = x - 9
- 20 = x - 9
x - 9 = - 20
x = -11
vậy: x = -11
4 - (27 - 3) = x - (13 - 4)
4 - 24 = x - 9
-20 = x - 9
x - 9 = -20
x = (-20) + 9
x = -11
4 - (27 - 3) = x - (13 - 4)
4 - 24 = x - 9
-20 = x - 9
x - 9 = -20
x = (-20) + 9
x = -11
4 - (27 - 3) = x - (13 - 4)
4 - 24 = x - 9
-20 = x - 9
x - 9 = -20
x = (-20) + 9
x = -11