$$20x+18=15x-206$$
$x = -\frac{224}{5} = -44\frac{4}{5} = -44.8$
$$20x+18-15x=-206$$
$$5x+18=-206$$
$$5x=-206-18$$
$$5x=-224$$
$$x=\frac{-224}{5}$$
$$x=-\frac{224}{5}$$
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