50-5=
19+7=
3+42=
42-9=
73-3=
25+8=
76-4=
32+30=
3+57=
41-5=
58-20=
46+6=
77-70=
4+25=
70-40=
66+9=
4+6+20=
22-5+7=
79-(3+17)=
85+(17-8)=