((1 - 5/4)^3/(1 + 1/8 - 7/4) - 1 + 3/5)^2/((- 6/5)/(8/5))^3 + 1=
=((- 1/4)^3/(- 5/8) - 1 + 3/5)^2/(- 3/4)^3 + 1=
=((- 1/64)/(- 5/8) - 1 + 3/5)^2/(- 27/64) + 1=
=(1/40 - 1 + 3/5)^2/(- 27/64) + 1=
=(- 3/8)^2/(- 27/64) + 1=
=9/64/(- 27/64) + 1=
=- 1/3 + 1= 2/3