From a 'negative taxi' to 'Positive taxi' :D

Algebra Level 5

\[\large 1729\bigg[\displaystyle\sum_{-1729}^{1729} |x+1|-|x-1|\bigg]- 1729\bigg[\displaystyle\sum_{-1729}^{1729} |x+1|-|x| \bigg] = ?\]

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