12-5= 13-9= 14-6= 15-7= 14-7+6=
15-9= 11-6= 16-5= 13-6= 12+8-5=
14-9= 12-8= 17-9= 16+4= 19-7+3=
19-8= 16+2= 18-4= 16-9= 11+8-9=
13+9= 14-7= 57+3=
40+30= 94-50= 89-8=
24+50= 90-30= 64-9=
10+30+40= 70-20-30= 19+(35-5)=
16+( )=25 24+( )=34 35+( )=39
80-( )=70 14-( )=8 50+( )=58