78-42= 55+20= 57-50= 66-5= 60+30=
36+23= 6+32= 20+46= 40-9= 98-37=
13-4= 25+8= 44-7= 17-9=
20+35= 97-70= 30+50= 53+9=
48-30= 80-5=
7+6= 3+54= 14-7= 19-8= 35+10=
20+80= 75+9= 93-30= 52-8= 0+25=
( )+20=80 ( )-73=10 84-( )=29
( )+7=49+38 37+( )=26+37 ( )+( )=35
7+4= 18-9= 11-6= 24-8=
70-40= 69-9= 26+40= 49+7=
59-8= 6+36= 99-90= 60+20=