$$+7+(-5)/(-7+2)-(+1-6)$$
$13$
$$7+\frac{-5}{-5}-\left(1-6\right)$$
$$7+1-\left(1-6\right)$$
$$8-\left(1-6\right)$$
$$8-\left(-5\right)$$
$$8+5$$
$$13$$
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