3 - [+ 3 - {3 - (3 - 3 - 3 )}
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3 - [ 3 - { 3 - ( 3 - 3 - 3 )}]
we first start with the innermost bracket
3 - [ 3 - { 3 - ( 3 - 3 - 3 )}]
3 - 3 - 3
= 3 - 6
= - 3
3 - [ 3 - { 3 - - 3 }]
3 - - 3
when there are two - signs next to each other in maths/algebra, they change into a + sign
3 + 3
= 6
3 - [ 3 - 6 ]
3 - 6
= - 3
3 - - 3
= 3 + 3
= 6
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