$$(\frac{7}{2}\times\frac{-3}{5})-\frac{5}{4}-\frac{13}{2}\times\frac{13}{5}$$
$-\frac{81}{4}=-20.25$
$$\frac{7}{2}\left(-\frac{3}{5}\right)-\frac{5}{4}-\frac{13}{2}\times \frac{13}{5}$$
$$\frac{7\left(-3\right)}{2\times 5}-\frac{5}{4}-\frac{13}{2}\times \frac{13}{5}$$
$$\frac{-21}{10}-\frac{5}{4}-\frac{13}{2}\times \frac{13}{5}$$
$$-\frac{21}{10}-\frac{5}{4}-\frac{13}{2}\times \frac{13}{5}$$
$$-\frac{42}{20}-\frac{25}{20}-\frac{13}{2}\times \frac{13}{5}$$
$$\frac{-42-25}{20}-\frac{13}{2}\times \frac{13}{5}$$
$$-\frac{67}{20}-\frac{13}{2}\times \frac{13}{5}$$
$$-\frac{67}{20}-\frac{13\times 13}{2\times 5}$$
$$-\frac{67}{20}-\frac{169}{10}$$
$$-\frac{67}{20}-\frac{338}{20}$$
$$\frac{-67-338}{20}$$
$$\frac{-405}{20}$$
$$-\frac{81}{4}$$
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$-\frac{81}{4} = -20\frac{1}{4} = -20.25$
