$$(-5+3-1)-(+1-5+3)$$
$-2$
$$-2-1-\left(1-5+3\right)$$
$$-3-\left(1-5+3\right)$$
$$-3-\left(-4+3\right)$$
$$-3-\left(-1\right)$$
$$-3+1$$
$$-2$$
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