$$241=18+(5X12-8)\div8$$
$X_{12} = \frac{1792}{5} = 358\frac{2}{5} = 358.4$
$$1928=144+5X_{12}-8$$
$$1928=136+5X_{12}$$
$$136+5X_{12}=1928$$
$$5X_{12}=1928-136$$
$$5X_{12}=1792$$
$$X_{12}=\frac{1792}{5}$$
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