Question
Simplify : $a -[-\{-(a-\overline{ b-c })\}]$
✓
Answer
$a-[-\{-(a-\overline{b-c})\}]$
$=a-[-\{-(a-b+c)\}]$
$=a-[-\{-a+b-c\}]$
$=a-[+a-b+c]$
$=a-a+b-c$
$=b-c$
$=a-[-\{-(a-b+c)\}]$
$=a-[-\{-a+b-c\}]$
$=a-[+a-b+c]$
$=a-a+b-c$
$=b-c$
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