$$4x=2\frac{1}{2}\times8.$$
$x=5$
$$8x=\left(2\times 2+1\right)\times 8$$
$$8x=\left(4+1\right)\times 8$$
$$8x=5\times 8$$
$$8x=40$$
$$x=\frac{40}{8}$$
$$x=5$$
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