$$(6/ { 7 }^{ 2 } ) \times (6/7)-5 \times (1/2)-3 \times (3/5)-3$$
$-\frac{24679}{3430}\approx -7.195043732$
$$\frac{6}{49}\times \frac{6}{7}-5\times \frac{1}{2}-3\times \frac{3}{5}-3$$
$$\frac{6\times 6}{49\times 7}-5\times \frac{1}{2}-3\times \frac{3}{5}-3$$
$$\frac{36}{343}-5\times \frac{1}{2}-3\times \frac{3}{5}-3$$
$$\frac{36}{343}-\frac{5}{2}-3\times \frac{3}{5}-3$$
$$\frac{72}{686}-\frac{1715}{686}-3\times \frac{3}{5}-3$$
$$\frac{72-1715}{686}-3\times \frac{3}{5}-3$$
$$-\frac{1643}{686}-3\times \frac{3}{5}-3$$
$$-\frac{1643}{686}-\frac{3\times 3}{5}-3$$
$$-\frac{1643}{686}-\frac{9}{5}-3$$
$$-\frac{8215}{3430}-\frac{6174}{3430}-3$$
$$\frac{-8215-6174}{3430}-3$$
$$-\frac{14389}{3430}-3$$
$$-\frac{14389}{3430}-\frac{10290}{3430}$$
$$\frac{-14389-10290}{3430}$$
$$-\frac{24679}{3430}$$
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$-\frac{24679}{3430} = -7\frac{669}{3430} = -7.1950437317784255$
