$$\frac{29}{70}-\frac{3.74}{30}+2\frac{3}{20}$$
$\frac{6404}{2625}\approx 2.439619048$
$$\frac{29}{70}-\frac{374}{3000}+\frac{2\times 20+3}{20}$$
$$\frac{29}{70}-\frac{187}{1500}+\frac{2\times 20+3}{20}$$
$$\frac{4350}{10500}-\frac{1309}{10500}+\frac{2\times 20+3}{20}$$
$$\frac{4350-1309}{10500}+\frac{2\times 20+3}{20}$$
$$\frac{3041}{10500}+\frac{2\times 20+3}{20}$$
$$\frac{3041}{10500}+\frac{40+3}{20}$$
$$\frac{3041}{10500}+\frac{43}{20}$$
$$\frac{3041}{10500}+\frac{22575}{10500}$$
$$\frac{3041+22575}{10500}$$
$$\frac{25616}{10500}$$
$$\frac{6404}{2625}$$
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$\frac{1601 \cdot 2 ^ {2}}{3 \cdot 7 \cdot 5 ^ {3}} = 2\frac{1154}{2625} = 2.439619047619048$
