Question

determinar o valor de x para o qual (4/9)x=81/16

Answer 1

$( \dfrac{4}{9} )x= \dfrac{81}{16} \to\\\\\\ \dfrac{4x}{9} = \dfrac{81}{16} \to~~~~multiplique~~cruzado:\\\\\\ 64x=729\to \\\\ \boxed{x= \dfrac{729}{64} }$