12 - [ 4 ÷ 2 + { 3 ÷ 1 ( 1 - 1/3 )}]
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12 - [ 4 ÷ 2 + { 3 ÷ 1 ( 1 - 1/3 )}]
=> 12 - [ 4 ÷ 2 + { 3 ÷ 1 ( 0.66 )}]
=> 12 - [ 4 ÷ 2 + { 3 ÷ 0.66}]
=> 12 - [ 4 ÷ 2 + {4.54}]
=> 12 - [ 4 ÷ 2 + 4.54]
=> 12 - [ 2 + 4.54]
=> 12 - [ 6.54]
=> 12 - 6.54
=> 5.46
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