5/4*[4/5*(2/3*x+3/2)+1]-(3/2)^2
5/4*[4/5*(2x/3+3/2)+1]-9/4
5/4*[4/5*(4x/6+9/6)+1]-9/4
5/4(16x/30+36/30+30/30)-9/4
5/4(16x/30+66/30)-9/4
80x/120+330/120-9/4
2x/3+55/20-9/4
2x/3+55/20-45/20
2×/3+10/20
2×/3+1/2
4×/6+3/6
