Simplify the expression:
a - 2b - [3a - 6b - {2a - C + (a - 4b + c)}]
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Answer:
=a-2b-[3a-6b-{2a-c+a-4b+c}]
=a-2b-[3a-6b-{3a-4b}
=a-2b-[3a-6b-3a+4b]
=a-2b-[-2b]
=a-2b+2b
=a
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