$$\frac{8}{9}x=18\frac{2}{3}$$
$x=21$
$$8x=3\left(18\times 3+2\right)$$
$$8x=3\left(54+2\right)$$
$$8x=3\times 56$$
$$8x=168$$
$$x=\frac{168}{8}$$
$$x=21$$
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