47-20= 35+40= 45-30= 28+30=
30+15= 23+70= 74+20= 20+56=
20+63= 56-30= 60+32=
80-7= 13+87= 16+24= 76+14=
67-12= 91-20= 46+28= 72-3=
28+9= 47+6= 25+( )=35 32-( )=23
6+9= 13-2= 95-5= 80+5=
9+9= 15-7= 48-8= 17-8=
37-7= 29-9= 16-9= 19-5-8=
6+20= 5+8= 40-40= 8+7-9=