$$A=(-\frac{2}{5}+\frac{-2}{3})\times\frac{1}{8}$$
$A=-\frac{2}{15}\approx -0.133333333$
$$A=\left(-\frac{2}{5}-\frac{2}{3}\right)\times \frac{1}{8}$$
$$A=\left(-\frac{6}{15}-\frac{10}{15}\right)\times \frac{1}{8}$$
$$A=\frac{-6-10}{15}\times \frac{1}{8}$$
$$A=-\frac{16}{15}\times \frac{1}{8}$$
$$A=\frac{-16}{15\times 8}$$
$$A=\frac{-16}{120}$$
$$A=-\frac{2}{15}$$
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$A≔-\frac{2}{15}$
