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Verified Answer :

gmany

We know:
\(|a|= \left\{\begin{array}{ccc}a&if\ a \ \textgreater \ 0\\0&if\ a=0\\-a&if\ a \ \textless \ 0\end{array}\right\\\\|2|=2\\|0|=0\\|-3|=3\)

\(|a+b|+|c|\)
substitute a = -3; b = 7; c = -15
\(|-3+7|+|-15|=|4|+15=4+15=19\)

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