$$4\frac{x}{9}=9$$
$x = \frac{81}{4} = 20\frac{1}{4} = 20.25$
$$\frac{x}{9}=\frac{9}{4}$$
$$x=\frac{9}{4}\times 9$$
$$x=\frac{9\times 9}{4}$$
$$x=\frac{81}{4}$$
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