$$-4+5-(4+4-5-(7+(6-4)-5-6)+4)$$
$-8$
$$1-\left(4+4-5-\left(7+6-4-5-6\right)+4\right)$$
$$1-\left(8-5-\left(7+6-4-5-6\right)+4\right)$$
$$1-\left(3-\left(7+6-4-5-6\right)+4\right)$$
$$1-\left(3-\left(13-4-5-6\right)+4\right)$$
$$1-\left(3-\left(9-5-6\right)+4\right)$$
$$1-\left(3-\left(4-6\right)+4\right)$$
$$1-\left(3-\left(-2\right)+4\right)$$
$$1-\left(3+2+4\right)$$
$$1-\left(5+4\right)$$
$$1-9$$
$$-8$$
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