Respuesta :
Answer
[tex]3(d - 7) = 6 \\ \\ = > 3d - 21 = 6 \\ \\ = > 3d = 6 + 21 \\ \\ = > 3d = 27 \\ \\ = > d = \cancel \frac{27}{3} \\ \\ = > d = 9[/tex]
[tex]3(d - 7) = 6 \\ \\ = > 3d - 21 = 6 \\ \\ = > 3d = 6 + 21 \\ \\ = > 3d = 27 \\ \\ = > d = \cancel \frac{27}{3} \\ \\ = > d = 9[/tex]
