$$\frac { 2 } { 7 } + \frac { 25 } { 21 } - \frac { 4 } { 7 }$$
$\frac{19}{21}\approx 0.904761905$
$$\frac{6}{21}+\frac{25}{21}-\frac{4}{7}$$
$$\frac{6+25}{21}-\frac{4}{7}$$
$$\frac{31}{21}-\frac{4}{7}$$
$$\frac{31}{21}-\frac{12}{21}$$
$$\frac{31-12}{21}$$
$$\frac{19}{21}$$
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$\frac{19}{3 \cdot 7} = 0.9047619047619048$
