$$0.19x-0.4=0.1+0.31x$$
$x = -\frac{25}{6} = -4\frac{1}{6} \approx -4.166666667$
$$0.19x-0.4-0.31x=0.1$$
$$-0.12x-0.4=0.1$$
$$-0.12x=0.1+0.4$$
$$-0.12x=0.5$$
$$x=\frac{0.5}{-0.12}$$
$$x=\frac{50}{-12}$$
$$x=-\frac{25}{6}$$
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