$$\frac{ 6 }{ 7 } -[ \frac{ 10 }{ 9 } +( \frac{ -4 }{ 18 } )]$$
$-\frac{2}{63}\approx -0.031746032$
$$\frac{6}{7}-\left(\frac{10}{9}-\frac{2}{9}\right)$$
$$\frac{6}{7}-\frac{10-2}{9}$$
$$\frac{6}{7}-\frac{8}{9}$$
$$\frac{54}{63}-\frac{56}{63}$$
$$\frac{54-56}{63}$$
$$-\frac{2}{63}$$
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$-\frac{2}{63} = -0.031746031746031744$
