$$3.2 a + 1.8 a - 12.8 = 15.2 - 5 a$$
$a=2.8$
$$5a-12.8=15.2-5a$$
$$5a-12.8+5a=15.2$$
$$10a-12.8=15.2$$
$$10a=15.2+12.8$$
$$10a=28$$
$$a=\frac{28}{10}$$
$$a=\frac{14}{5}$$
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