If in a system, !,@,#,$,%,^,&,*,(,) correspond respectively to the digits 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ,then find the value of @# - $! + %& - !@.
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If in a system, !,@,#,$,%,^,&,*,(,) correspond respectively to the digits 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ,then find the value of @# - $! + %& - !@.