$$0.16 ( 5 x - 2 ) = 0.4 + 7$$
$x=9.65$
$$0.8x-0.32=0.4+7$$
$$0.8x-0.32=7.4$$
$$0.8x=7.4+0.32$$
$$0.8x=7.72$$
$$x=\frac{7.72}{0.8}$$
$$x=\frac{772}{80}$$
$$x=\frac{193}{20}$$
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