$$B = - \frac { \frac { 4 } { 5 } } { 3 } - \frac { 3 } { 10 }$$
$B=-\frac{17}{30}\approx -0.566666667$
$$B=-\frac{4}{5\times 3}-\frac{3}{10}$$
$$B=-\frac{4}{15}-\frac{3}{10}$$
$$B=-\frac{8}{30}-\frac{9}{30}$$
$$B=\frac{-8-9}{30}$$
$$B=-\frac{17}{30}$$
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$B≔-\frac{17}{30}$
