$$x = \frac { 4 } { 5 } ( x + 10 )$$
$x=40$
$$x=\frac{4}{5}x+\frac{4}{5}\times 10$$
$$x=\frac{4}{5}x+\frac{4\times 10}{5}$$
$$x=\frac{4}{5}x+\frac{40}{5}$$
$$x=\frac{4}{5}x+8$$
$$x-\frac{4}{5}x=8$$
$$\frac{1}{5}x=8$$
$$x=8\times 5$$
$$x=40$$
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