$$a[0.9-\{2.3-3\cdot2-(7\cdot1-5\cdot4-3\cdot5)3\}$$
$-3.4$
$$2\left(0.9-\left(4-3.2-\left(7.1-5.4-3.5\right)\right)\right)$$
$$2\left(0.9-\left(0.8-\left(7.1-5.4-3.5\right)\right)\right)$$
$$2\left(0.9-\left(0.8-\left(1.7-3.5\right)\right)\right)$$
$$2\left(0.9-\left(0.8-\left(-1.8\right)\right)\right)$$
$$2\left(0.9-\left(0.8+1.8\right)\right)$$
$$2\left(0.9-2.6\right)$$
$$2\left(-1.7\right)$$
$$-3.4$$
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