$$40-5\times2g\ 3+(19-3)\div8$$
$42-30g$
$$40-10g\times 3+\frac{19-3}{8}$$
$$40-30g+\frac{19-3}{8}$$
$$40-30g+\frac{16}{8}$$
$$40-30g+2$$
$$42-30g$$
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