13-7= 45+9= 72-3= 40-3=
42-6= 22-9= 4+46= 32+15=
75+8= 70+18= 39+4= 80-8=
16-5= 69-9= 19-9= 27+60=
65-8= 31-6= 69-8= 52+5=