5/2+(9/8-3/2)=5/2+(9/8−12/8)=5/2−3/8=20/8−3/8=17/8
5/2+(9/8-3/2)=5/2+9/8-3/2=5/2-3/2+9/8=1+9/8=17/8
5/2+(9/8-3/2)=40/8+9/8-12/8=49/8-12/8=37/8