Simplify n - {1 - [n - (1 - n) - 1]}.
n - 1
-n - 1
3n - 3
-3n + 3

N - {1 - [n - (1 - n) - 1]}          first you do - (1 - n)  [multiply -1 to 1 - n)

n - {1 - [n - 1 + n - 1]}

n - {1 - [n + n - 1 - 1]}

n - {1 - [2n - 2]}                 you do - (2n - 2)  [multiply -1 to 2n - 2)

n - {1 -2n + 2}

n - {-2n + 3}                     you do - (-2n + 3)  [multiply -1 to -2n + 3)

n + 2n - 3

3n - 3
answer

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