$$B=- \frac{ 4 }{ 7 } \times \frac{ 7 }{ 3 }$$
$B = -\frac{4}{3} = -1\frac{1}{3} \approx -1.333333333$
$$B=\frac{-4\times 7}{7\times 3}$$
$$B=\frac{-4}{3}$$
$$B=-\frac{4}{3}$$
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$B≔-\frac{4}{3}$
