$$\frac{-2}{7}\div2\frac{1}{4}$$
$-\frac{8}{63}\approx -0.126984127$
$$\frac{-2\times 4}{7\left(2\times 4+1\right)}$$
$$\frac{-8}{7\left(2\times 4+1\right)}$$
$$\frac{-8}{7\left(8+1\right)}$$
$$\frac{-8}{7\times 9}$$
$$\frac{-8}{63}$$
$$-\frac{8}{63}$$
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$-\frac{8}{63} = -0.12698412698412698$
