Verified answer

11x - (7x - 4)

11x - 7x + 4

4x +4

12x + 4 = 7x - 21

5x = -25

x = -5

11x - (7x-4)

11x -7x +4

4x -4

x-1

........................................

12x+4=7x-21

12x -7x= -4 -21

5x = -25

x = -5

11x-7x-4

4x-4

5x+4=-21

5x=-25

x=-25