$$\frac { 2 x } { 5 } = \frac { 8 - x } { 10 }$$
$x = \frac{8}{5} = 1\frac{3}{5} = 1.6$
$$2\times 2x=8-x$$
$$4x=8-x$$
$$4x+x=8$$
$$5x=8$$
$$x=\frac{8}{5}$$
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