$$\frac { } { \frac { - 3 } { 7 } + \frac { 9 } { 5 } - \frac { 5 } { 4 } }$$
$\frac{140}{17}\approx 8.235294118$
$$\frac{1}{-\frac{3}{7}+\frac{9}{5}-\frac{5}{4}}$$
$$\frac{1}{-\frac{15}{35}+\frac{63}{35}-\frac{5}{4}}$$
$$\frac{1}{\frac{-15+63}{35}-\frac{5}{4}}$$
$$\frac{1}{\frac{48}{35}-\frac{5}{4}}$$
$$\frac{1}{\frac{192}{140}-\frac{175}{140}}$$
$$\frac{1}{\frac{192-175}{140}}$$
$$\frac{1}{\frac{17}{140}}$$
$$1\times \frac{140}{17}$$
$$\frac{140}{17}$$
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$\frac{2 ^ {2} \cdot 5 \cdot 7}{17} = 8\frac{4}{17} = 8.235294117647058$
