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18+194-( 23-45+38)-35+19+87)=
18+194-23+45-38-35+19+87=(18+194+45+19+87) - ( 23+38+35)=
363-96=267
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56-{23-[34-(18+13)]}-[45-(12+9)]=
56-{23-[34-18-13)]}-[45-12-9)]=
56-{23-34+18+13}-45+12+9=
56-23+34-18-13-45+12+9=12