$$0.18(5x-4)=0.5x+0.8$$
$x=3.8$
$$0.9x-0.72=0.5x+0.8$$
$$0.9x-0.72-0.5x=0.8$$
$$0.4x-0.72=0.8$$
$$0.4x=0.8+0.72$$
$$0.4x=1.52$$
$$x=\frac{1.52}{0.4}$$
$$x=\frac{152}{40}$$
$$x=\frac{19}{5}$$
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