$$(-\frac{7}{9}+2-\frac{6}{7}-\frac{-13}{21}$$
$\frac{62}{63}\approx 0.984126984$
$$-\frac{7}{9}+\frac{18}{9}-\frac{6}{7}-\frac{-13}{21}$$
$$\frac{-7+18}{9}-\frac{6}{7}-\frac{-13}{21}$$
$$\frac{11}{9}-\frac{6}{7}-\frac{-13}{21}$$
$$\frac{77}{63}-\frac{54}{63}-\frac{-13}{21}$$
$$\frac{77-54}{63}-\frac{-13}{21}$$
$$\frac{23}{63}-\frac{-13}{21}$$
$$\frac{23}{63}-\left(-\frac{13}{21}\right)$$
$$\frac{23}{63}+\frac{13}{21}$$
$$\frac{23}{63}+\frac{39}{63}$$
$$\frac{23+39}{63}$$
$$\frac{62}{63}$$
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$\frac{2 \cdot 31}{3 ^ {2} \cdot 7} = 0.9841269841269841$
