$$0.13-[17-\{0.5+1.2-(40\div2\times7)\}]$$
$-155.17$
$$0.13-\left(17-\left(1.7-\frac{40}{2}\times 7\right)\right)$$
$$0.13-\left(17-\left(1.7-20\times 7\right)\right)$$
$$0.13-\left(17-\left(1.7-140\right)\right)$$
$$0.13-\left(17-\left(-138.3\right)\right)$$
$$0.13-\left(17+138.3\right)$$
$$0.13-155.3$$
$$-155.17$$
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