Explicación paso a paso:
[tex](3m + 9) + (m + 3) = (3m + m) + (9 + 3) \\ 4m + 12[/tex]
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Explicación paso a paso:
[tex](3m + 9) + (m + 3) = (3m + m) + (9 + 3) \\ 4m + 12[/tex]