$$5\mathcal{\Sigma}13+12\div3(2\times2)-4\mathcal{6}$$
$5\left(Σ_{13}-6\right)$
$$5Σ_{13}+4\times 2\times 2-46$$
$$5Σ_{13}+8\times 2-46$$
$$5Σ_{13}+16-46$$
$$5Σ_{13}-30$$
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$$5\left(Σ_{13}-6\right)$$
