-6 - 3 = -9
-1.5 - 2*(1/3) = -1.5 - (2/3) = -1.5 - 0.6667 = -2.1667

Итак, -6 - 3 : (-1.5) - 2*(1/3) = -9 - 2.1667 = -11.1667.