$$40-5 \times 2 \times 3+19-3 \div 18$$
$\frac{173}{6}\approx 28.833333333$
$$40-10\times 3+19-\frac{3}{18}$$
$$40-30+19-\frac{3}{18}$$
$$10+19-\frac{3}{18}$$
$$29-\frac{3}{18}$$
$$29-\frac{1}{6}$$
$$\frac{174}{6}-\frac{1}{6}$$
$$\frac{174-1}{6}$$
$$\frac{173}{6}$$
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$\frac{173}{2 \cdot 3} = 28\frac{5}{6} = 28.833333333333332$
