$$\frac{ 3 }{ 7 } + \frac{ 1 }{ 21 } - \frac{ 1 }{ 14 } =$$
$\frac{17}{42}\approx 0.404761905$
$$\frac{9}{21}+\frac{1}{21}-\frac{1}{14}$$
$$\frac{9+1}{21}-\frac{1}{14}$$
$$\frac{10}{21}-\frac{1}{14}$$
$$\frac{20}{42}-\frac{3}{42}$$
$$\frac{20-3}{42}$$
$$\frac{17}{42}$$
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$\frac{17}{2 \cdot 3 \cdot 7} = 0.40476190476190477$
