a) x - 5 = -1
x = -1+5
x = 4
vậy x=4
b) x + 30 = - 4
x = -4-30
x = - 34
vậy x= -34
c) x - ( - 24 ) = 3
x + 24 = 3
x = 3-24
x = -21
vậy x= -21
d) 22 - ( - x) = 12
22+x =12
x = 12-22
x = -10
vậy x=-10
e) ( x + 5 ) + ( x - 9 ) = x + 2
x + 5 + x - 9 = x + 2
x + x -x = 2-5+9
x = 8
vậy x=8
f) ( 27- x) + ( 15 + x) = x - 24
27- x + 15 + x = x - 24
- x + x-x = - 24-27-15
-x = -66
x = 66
vậy x=66