$$39-4\Sigma16\div(7-3)2-23$$
$16-2Σ_{16}$
$$39-\frac{4Σ_{16}}{4}\times 2-23$$
$$39-Σ_{16}\times 2-23$$
$$39-2Σ_{16}-23$$
$$16-2Σ_{16}$$
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$2\left(8-Σ_{16}\right)$
$$factor(39-\frac{4Σ_{16}}{4}\times 2-23)$$
$$factor(39-Σ_{16}\times 2-23)$$
$$factor(39-2Σ_{16}-23)$$
$$factor(16-2Σ_{16})$$
$$2\left(8-Σ_{16}\right)$$
