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1000-120:{75+225:[34-75:5-7×(48-322:7)]}

Răspuns :

1000-120:{75+225:[34-75:5-7x(48-322:7)]}=
1000-120:{75+225:[34-15-7x(48-46)]}=
1000-120:[75+225:(19-7x2)]=
1000-120:[75+225:(19-14)=
1000-120:(75+225:5)=
1000-120:(75+45)=
1000-120:120=
1000-1=999