$$( \frac{ 3 }{ 8 } )- \{ ( \frac{ 3 }{ 4 } \times 20)-(8/ \frac{ 4 }{ 5 } ) \}$$
$-\frac{37}{8}=-4.625$
$$\frac{3}{8}-\left(\frac{3\times 20}{4}-\frac{8}{\frac{4}{5}}\right)$$
$$\frac{3}{8}-\left(\frac{60}{4}-\frac{8}{\frac{4}{5}}\right)$$
$$\frac{3}{8}-\left(15-\frac{8}{\frac{4}{5}}\right)$$
$$\frac{3}{8}-\left(15-8\times \frac{5}{4}\right)$$
$$\frac{3}{8}-\left(15-\frac{8\times 5}{4}\right)$$
$$\frac{3}{8}-\left(15-\frac{40}{4}\right)$$
$$\frac{3}{8}-\left(15-10\right)$$
$$\frac{3}{8}-5$$
$$\frac{3}{8}-\frac{40}{8}$$
$$\frac{3-40}{8}$$
$$-\frac{37}{8}$$
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$-\frac{37}{8} = -4\frac{5}{8} = -4.625$
