33-12= 29+36= 54-20=
39-18= 27+27= 58-14=
54+45= 78-44= 89-29=
97-34= 62+19= 64+28=
62-42= 76-22= 30+12=
73-52= 3+33= 29+2=
20+71= 52-12= 87-34=