$$\frac{ 1 }{ 7 } + \frac{ 3 }{ 21 } - \frac{ 1 }{ 14 }$$
$\frac{3}{14}\approx 0.214285714$
$$\frac{1}{7}+\frac{1}{7}-\frac{1}{14}$$
$$\frac{1+1}{7}-\frac{1}{14}$$
$$\frac{2}{7}-\frac{1}{14}$$
$$\frac{4}{14}-\frac{1}{14}$$
$$\frac{4-1}{14}$$
$$\frac{3}{14}$$
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$\frac{3}{2 \cdot 7} = 0.21428571428571427$
