$$\frac{19}{2}b=\frac{7}{13}$$
$b=\frac{14}{247}\approx 0.056680162$
$$b=\frac{7}{13}\times \frac{2}{19}$$
$$b=\frac{7\times 2}{13\times 19}$$
$$b=\frac{14}{247}$$
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