1/3х+2(2/3х-1/6)=-1 1/6

1/3х + 2*(2/3х - 1/6) = - 1 1/6, 1/3х + 4/3х - 2/6 = - 7/6, 5/3х = - 7/6 + 2/6, 10/6х = - 5/6, х = - 5/6 : 10/6 = - 5/6 * 6/10, х = - 1/2 (или - 0,5)