(-3/2)-3 = 1 divided by (-3/2)3 = 1 divided by (-27/8) = -8/27
(9/4)-2 = 1 divided by (9/4)2 = 1 divided by (81/16) = 16/81
Considering the unknown number to divide -8/27 to get 16/81 as x, we get the equation -8/27 divided by x = 16/81
therefore x = -8/27 divided by 16/81 = (-8/27)(81/16) = (-8*81) (27*16) = -3/2