$$\frac{ 3 }{ 7 } + \frac{ 4 }{ 7 } - \frac{ 2 }{ 7 }$$
$\frac{5}{7}\approx 0.714285714$
$$\frac{3+4}{7}-\frac{2}{7}$$
$$\frac{7}{7}-\frac{2}{7}$$
$$\frac{7-2}{7}$$
$$\frac{5}{7}$$
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$\frac{5}{7} = 0.7142857142857143$
