Respuesta:
-{-{-(a+b-c)]}-{+[-(c-a+b)]}+[-{-a+(b)}]
-{-{-a-b+c}}- {+[-c+a-b]} +[-{-a+b}]
-{+a+b-c} - {-c+a-b} + [+a-b]
-a - b +c + c - a +b +a -b
-a -b +2c
espero aberte ayudado
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Respuesta:
-{-{-(a+b-c)]}-{+[-(c-a+b)]}+[-{-a+(b)}]
-{-{-a-b+c}}- {+[-c+a-b]} +[-{-a+b}]
-{+a+b-c} - {-c+a-b} + [+a-b]
-a - b +c + c - a +b +a -b
-a -b +2c
espero aberte ayudado