Question

Simplify. a - {4b - [a - (5b - c) + 3c - (a - b - 9c)]}

Answer 1

Answer ....

3a-10b+7c

It is derived by the simplification

Answer 2

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Here is your answer
$a - (4b - (a - (5b - c) + 3c - (a - b - 9c))) \\ = a - (4b - (a - 5b + c + 3c - a + b + 9c)) \\ = a - (4b - ( - 4b + 13c)) \\ = a - (4b + 4b - 13c) \\ = a - (8b - 13c) \\ = a - 8b + 13c$

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