$$1-(5-3+2)-[5-(6-3+1)-2]$$
$-2$
$$1-\left(2+2\right)-\left(5-\left(6-3+1\right)-2\right)$$
$$1-4-\left(5-\left(6-3+1\right)-2\right)$$
$$-3-\left(5-\left(6-3+1\right)-2\right)$$
$$-3-\left(5-\left(3+1\right)-2\right)$$
$$-3-\left(5-4-2\right)$$
$$-3-\left(1-2\right)$$
$$-3-\left(-1\right)$$
$$-3+1$$
$$-2$$
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