$$8 \frac { 4 } { 7 } - 3 \frac { 2 } { 5 } - 1 \frac { 1 } { 10 }$$
$\frac{57}{14}\approx 4.071428571$
$$\frac{56+4}{7}-\frac{3\times 5+2}{5}-\frac{1\times 10+1}{10}$$
$$\frac{60}{7}-\frac{3\times 5+2}{5}-\frac{1\times 10+1}{10}$$
$$\frac{60}{7}-\frac{15+2}{5}-\frac{1\times 10+1}{10}$$
$$\frac{60}{7}-\frac{17}{5}-\frac{1\times 10+1}{10}$$
$$\frac{300}{35}-\frac{119}{35}-\frac{1\times 10+1}{10}$$
$$\frac{300-119}{35}-\frac{1\times 10+1}{10}$$
$$\frac{181}{35}-\frac{1\times 10+1}{10}$$
$$\frac{181}{35}-\frac{10+1}{10}$$
$$\frac{181}{35}-\frac{11}{10}$$
$$\frac{362}{70}-\frac{77}{70}$$
$$\frac{362-77}{70}$$
$$\frac{285}{70}$$
$$\frac{57}{14}$$
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$\frac{3 \cdot 19}{2 \cdot 7} = 4\frac{1}{14} = 4.071428571428571$
