150 - [70 - {60 - (30 +
(30 + 20)} - 10]
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7
Answer:
ok
Step-by-step explanation:
150 - [70 - {60 - (50 ) } - 10 ]
150 - [70 - {60 - 50 } - 10 ]
150 - [ 70 - { 10 } - 10 ]
150 - [ 70 - 10 ]
150 - 60
90
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