9+4= 15-7= 37-8= 5+60=
52+20= 97-50= 88+2= 89-9=
70+24= 59-50= 57+7= 62-5=
6+44+23= 76-6-8= 50+33-70=
27+(42+8)= 42-(10+30)= 8+(69-60)=