$$3a-\frac{2}{5}=\frac{1}{5}-2a$$
$a=\frac{3}{25}=0.12$
$$3a-\frac{2}{5}+2a=\frac{1}{5}$$
$$5a-\frac{2}{5}=\frac{1}{5}$$
$$5a=\frac{1}{5}+\frac{2}{5}$$
$$5a=\frac{1+2}{5}$$
$$5a=\frac{3}{5}$$
$$a=\frac{\frac{3}{5}}{5}$$
$$a=\frac{3}{5\times 5}$$
$$a=\frac{3}{25}$$
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