$$[3.(2.3+5.4-3.7) \div (6 \div 2+3.4-10)]$$
$-\frac{10}{3}\approx -3.333333333$
$$\frac{3\left(7.7-3.7\right)}{\frac{6}{2}+3.4-10}$$
$$\frac{3\times 4}{\frac{6}{2}+3.4-10}$$
$$\frac{12}{\frac{6}{2}+3.4-10}$$
$$\frac{12}{3+3.4-10}$$
$$\frac{12}{6.4-10}$$
$$\frac{12}{-3.6}$$
$$\frac{120}{-36}$$
$$-\frac{10}{3}$$
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$-\frac{10}{3} = -3\frac{1}{3} = -3.3333333333333335$