$$39 - 7 \{ 28 \div ( 17 - 10 ) + 1 \}$$
$4$
$$39-7\left(\frac{28}{7}+1\right)$$
$$39-7\left(4+1\right)$$
$$39-7\times 5$$
$$39-35$$
$$4$$
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$2^{2}$
