$$4 \times (50/5)+15-(6 \times 3+8)-16$$
$13$
$$4\times 10+15-\left(6\times 3+8\right)-16$$
$$40+15-\left(6\times 3+8\right)-16$$
$$55-\left(6\times 3+8\right)-16$$
$$55-\left(18+8\right)-16$$
$$55-26-16$$
$$29-16$$
$$13$$
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