60+(35-15)= 42-(25+5)= 67-(45+13)= 64-(31+5)=
35-(20-10)= 41-(12-6)= 28-(14+6)= 51+(39-21)=
45-(13+7)= 24-(18-2)= 58-(9+11)= 19-(16-3)=
77+(13-9)= 64-(12-2)= 62+(29-20)= 88-(2+7)=
69-(5+25)= 43-(2+8)=
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