$$0.19x-0.4=0.1+0.31$$
$x = \frac{81}{19} = 4\frac{5}{19} \approx 4.263157895$
$$0.19x-0.4=0.41$$
$$0.19x=0.41+0.4$$
$$0.19x=0.81$$
$$x=\frac{0.81}{0.19}$$
$$x=\frac{81}{19}$$
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