$$4\frac{9}{35}-2\frac{4}{21}-1\frac{3}{14}$$
$\frac{179}{210}\approx 0.852380952$
$$\frac{140+9}{35}-\frac{2\times 21+4}{21}-\frac{1\times 14+3}{14}$$
$$\frac{149}{35}-\frac{2\times 21+4}{21}-\frac{1\times 14+3}{14}$$
$$\frac{149}{35}-\frac{42+4}{21}-\frac{1\times 14+3}{14}$$
$$\frac{149}{35}-\frac{46}{21}-\frac{1\times 14+3}{14}$$
$$\frac{447}{105}-\frac{230}{105}-\frac{1\times 14+3}{14}$$
$$\frac{447-230}{105}-\frac{1\times 14+3}{14}$$
$$\frac{217}{105}-\frac{1\times 14+3}{14}$$
$$\frac{31}{15}-\frac{1\times 14+3}{14}$$
$$\frac{31}{15}-\frac{14+3}{14}$$
$$\frac{31}{15}-\frac{17}{14}$$
$$\frac{434}{210}-\frac{255}{210}$$
$$\frac{434-255}{210}$$
$$\frac{179}{210}$$
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$\frac{179}{2 \cdot 3 \cdot 5 \cdot 7} = 0.8523809523809524$
