53-50+47= 64+(30-30)= 29-20+9= 20+(55-20)= 4+66+30=
54+8-30= 6+20+30= 68-(38-30)= 9+28+20= 50-3+50=
60-(30+20)= 9+51-40= 9+(65-30)= 8+77+20= 41-41+10=
50+(43-30)= 21-3+8= 76-(22+8)= 67-9-3= 32-4+60=
41-(12-9)= 38-9+8= 30-(2+7)= 72-6-7= 66-(14+6)=
39-(32+7)= 40-9+4= 53+(50-50)= 35+8-6= 39-(14-5)=