$$0.5x+0.8=2.6-0.4$$
$x=2.8$
$$0.5x+0.8=2.2$$
$$0.5x=2.2-0.8$$
$$0.5x=1.4$$
$$x=\frac{1.4}{0.5}$$
$$x=\frac{14}{5}$$
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