a.17-(43-/x+11/)=45
(43-/x+11/)=17-45
(43-/x+11/)=-28
/x+11/=43-(-28)
/x+11/=71
TH1:x+11=71;x=71-11=60
TH2:x+11=-71;x=-71-11=-82
b.32.x= -27
9.x=-27
x=-27:9
x=-3
c.x+15= -2
x=-2-15
x=-17
a. 17- (43-/x+11/) = 45
=> 43 - /x+11/ =17 - 45 = -28
=> /x+11/ = 43 - (-28) = 71
=> x+11 = 71 hoặc x+11 = -71
=> x = 71-11 hoặc x = -71 - 11
=> x= 60 hoặc x= -82
b. 3^2 .x = -27
=> 9.x = -27
=> x = -27 : 9
=> x = -3/2
c. x+15 = -2
=> x= -2 - 15
=> x = -17