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