150 - [70 - {60 - (30 + 20)} - 10]
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Explanation:
150 - [ 70 - { 60 - (30 + 20)} - 10]
150 - [ 70 - { 60 - 50 } - 10]
150 - [ 70 - 10 - 10 ]
150 - [ 60 - 10 ]
150 - 50
100
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