[(2/3)^2007*(-1.5)^2007]^2007=[(2/3)^2007*(-2/[(2/3)^2007*(-2/3)^(-2007)]^2007
=[-(2/3)^(2007-2007)]^2007
=[-(2/3)^0]^2007
=(-1)^2007=-1
[(2/3)^2007*(-1.5)^2007]^2007=[(2/3)^2007*(-2/[(2/3)^2007*(-2/3)^(-2007)]^2007
=[-(2/3)^(2007-2007)]^2007
=[-(2/3)^0]^2007
=(-1)^2007=-1