Question

(x+19-21)= -31

 

Answer 1

(x+19-21)=-31

x+19      = -31+21

x+19      = -10

x           =-10-19

x          =-29

Answer 2

 

(x+19-21)= -31

x+19        =-31+21

x+19        =-10

x               =-10-19

x               =-29

Answer 3

(x+19-21)= -31

 x+19=(-31)+21

 x+19=-10

 x     =(-10)-19

 x     =-29

Vậy x= -29

Answer 4

x+19 = -31 +21

x+19=-10

x=-10-19

x=-29