Verified answer

3х - ( 10 - 9х ) = 22 х

3х - 10 + 9х = 22х

3х + 9х - 22х =  10

-10х = 10

х = 10: (-10)

х = - 1

проверка:

3 * ( - 1 ) - ( 10 - 9 * ( - 1 ) = 22 * ( -1 )

- 3 - ( 10 + 9 ) = - 22

- 3 - 19 = - 22

- 22 = - 22  ( верно)