Ответ:
a-(b+c)=a-b+c
-b-c=-b+c
-c=c
-c-c=0
-2c=0
c=0
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Ответ:
a-(b+c)=a-b+c
-b-c=-b+c
-c=c
-c-c=0
-2c=0
c=0