Verified answer

1/3х - 3 * (2 - 1/18) = 1/3х - 6 + 3/18 = 1/3х - 6 + 1/6 = 1/3х - 5 5/6 

1/3х - 5 5/6       при х = - 4

1/3 * (- 4) - 5 5/6 = - 4/3 - 35/6 = - 8/6 - 35/6 = - 43/6 = - 7 1/6