14-6= 11-8= 7+5= 17-7+2=
8+9= 12-3= 15-9= 11-3-3=
19-8= 70+8= 78-8= 13-(6+3)=
50+40= 90-50= 54+4= 7+(14-9)=
35+50= 38-20= 59-5= 30+40-20 =
6+54= 85-9= 37-20+40= 39-(9-5)=