25+8= 50+16= 58-20= 39+40=
75+20= 84-5= 65-7= 35+6=
7+13+54= 7+(46+4)= 83-(28-8)=
56+4-20= 93-(9-6)= ( )-50=16
24+30+5= 46-6+40= 73+20-3=