14-8= 46+30= 13-6= 6+35=
50+23= 6+52= 52-40= 26-3=
47+4= 44+2= 5+28= 17-9=
12-7= 31+9= 50-5= 25-8=
64-40= ( )-7=9 ( )+5=12 15-( )=7
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