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