86-8= 60-50= 85-2=
81-9= 76-9= 70-28=
89-50= 78-10= 83-20=
40-7= 20-8= 66-9=
40-8= 70-9= 44-8=
62-7= 67-7= 26-7=
53-9= 83-7= 97-30=
75-9= 47-9= 46-6=
91-3= 72-8= 38-3=
98-7= 67-6= 33-33=