Respuesta:
[tex]15 - a + 4a = - 6 \\ 15 + 3a = - 6 \\ 3a = - 6 - 15 \\ 3a = - 21 \\ a = - 7[/tex]
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Respuesta:
[tex]15 - a + 4a = - 6 \\ 15 + 3a = - 6 \\ 3a = - 6 - 15 \\ 3a = - 21 \\ a = - 7[/tex]