simplify :a - (b - (c - (a - b - c) - c) + a
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a - (b - (c - (a - b - c) - c) + a
a-(b- (c - (a-b-c) - c) +a
a-(b-(c-a+b+c-c+a
a-(b-(c+b
a-(b-c-b
a-(-c
a+c
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