$$\frac{ 7 }{ 278 \times 7777777777 } -10$$
$-\frac{3088888888579}{308888888858}\approx -10$
$$\frac{7}{2162222222006}-10$$
$$\frac{1}{308888888858}-10$$
$$\frac{1}{308888888858}-\frac{3088888888580}{308888888858}$$
$$\frac{1-3088888888580}{308888888858}$$
$$-\frac{3088888888579}{308888888858}$$
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$-\frac{3088888888579}{308888888858} = -9\frac{308888888857}{308888888858} = -9.999999999996763$
