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Respuesta:
[tex]a^{2}[/tex] = 12
Explicación paso a paso:
[tex]\frac{2a}{9} = \frac{8}{3a}[/tex]
2a x 3a = 9 x 8
6[tex]a^{2}[/tex] = 72
[tex]a^{2}[/tex] = 12