Explicación paso a paso:
[tex]4 + ( - 6) + ( - 15) + 9 \\ 4 - 6 - 15 + 9 \\ 9 + 4 - 15 - 6 \\ 13 - 15 - 6 \\ - 2 - 6 \\ - 8[/tex]
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Explicación paso a paso:
[tex]4 + ( - 6) + ( - 15) + 9 \\ 4 - 6 - 15 + 9 \\ 9 + 4 - 15 - 6 \\ 13 - 15 - 6 \\ - 2 - 6 \\ - 8[/tex]