$$B=- \frac{ 4 }{ \frac{ 5 }{ \frac{ 2 }{ 3 } } } - \frac{ 3 }{ 10 }$$
$B=-\frac{5}{6}\approx -0.833333333$
$$B=-\frac{4\times \frac{2}{3}}{5}-\frac{3}{10}$$
$$B=-\frac{\frac{4\times 2}{3}}{5}-\frac{3}{10}$$
$$B=-\frac{\frac{8}{3}}{5}-\frac{3}{10}$$
$$B=-\frac{8}{3\times 5}-\frac{3}{10}$$
$$B=-\frac{8}{15}-\frac{3}{10}$$
$$B=-\frac{16}{30}-\frac{9}{30}$$
$$B=\frac{-16-9}{30}$$
$$B=\frac{-25}{30}$$
$$B=-\frac{5}{6}$$
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$B≔-\frac{5}{6}$
