10+(75-65)= 37-(14+6)= 37+(44-34)= 44+(11-2)=
34-(30-20)= 81-(12-5)= 50-(37-7)= 28-(25-10)=
30-(9+4)= 49+(18+2)= 59-(57-7)= 67+(30-20)=
81-(42+8)= 38+(33-33)= 70-(25+5)= (29-19)+60=
81-(66-56)= 17-(74-72)= 54+(25-20)= 30-(17-3)=
23-(9+1)= 52-
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