AMC 10 2020b Problem 1

What is the value of $1-(-2)-3-(-4)-5-(-6)?$ $\textbf{(A)}\ -20 \textbf{(B)}\ -3 \textbf{(C)}\ 3 \textbf{(D)}\ 5 \textbf{(E)}\ 21$

Dataset text NuminaMath-1.5. Quoted with source.

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