$$19 + 8 \div 2 - 2 \times 1 + 5 2 \div 5$$
$23$
$$19+4-2\times 1+\frac{5\times 2}{5}$$
$$23-2\times 1+\frac{5\times 2}{5}$$
$$23-2+\frac{5\times 2}{5}$$
$$21+\frac{5\times 2}{5}$$
$$21+2$$
$$23$$
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